Forward-Looking Statements



In addition to historical information, this Quarterly Report on Form 10-Q
contains forward-looking statements, which are generally identifiable by use of
the words "believes," "expects," "intends," "anticipates," "plans to," "seeks,"
"should," "estimates," "projects," "may," "likely" or similar expressions. Such
statements may include, but are not limited to, statements about future
financial and operating results, the Company's plans, objectives, expectations
and intentions and other statements that are not historical facts.
Forward-looking statements are neither historical facts nor assurances of future
performance. Such statements are based upon the beliefs and expectations of
Clean Harbors' management as of this date only and are subject to certain risks
and uncertainties that could cause actual results to differ materially,
including, without limitation, those items identified as "Risk Factors," in this
report under Item 1A and in our Annual Report on Form 10-K filed with the
Securities and Exchange Commission ("SEC") on February 23, 2022, and in other
documents we file from time to time with the SEC. Therefore, readers are
cautioned not to place undue reliance on these forward-looking statements, which
reflect management's opinions only as of the date hereof. Our actual results and
financial condition may differ materially from those indicated in the
forward-looking statements. Clean Harbors undertakes no obligation to revise or
publicly release the results of any revision to these forward-looking statements
other than through its filings with the SEC, which may be viewed in the
"Investors" section of the Clean Harbors website.

Overview



We are North America's leading provider of environmental and industrial services
supporting our customers in finding environmentally responsible solutions to
further their sustainability goals in today's world. Everywhere industry meets
the environment, we strive to provide eco-friendly products and services that
protect and restore North America's natural environment. We believe we operate,
in the aggregate, the largest number of hazardous waste incinerators, landfills
and treatment, storage and disposal facilities ("TSDFs") in North America. We
serve a diverse customer base, including Fortune 500 companies, across the
chemical, energy, manufacturing and additional markets, as well as numerous
government agencies. These customers rely on us to deliver a broad range of
services including but not limited to end-to-end hazardous waste management,
emergency response, industrial cleaning and maintenance and recycling services.
We believe we are also the largest re-refiner and recycler of used oil in North
America and the largest provider of parts washer and related environmental
services to commercial, industrial and automotive customers in North America.

Performance of our segments is evaluated on several factors of which the primary
financial measure is Adjusted EBITDA, as reconciled to our net income and
described more fully below. The following is a discussion of how management
evaluates its segments in regards to other factors including key performance
indicators that management uses to assess the segments' results, as well as
certain macroeconomic trends and influences that impact each reportable segment:

•Environmental Services - Environmental Services segment results are predicated
upon customer demand for waste services, waste volumes generated by such
services and project work for which waste handling and/or disposal is required.
Environmental Services results are also impacted by the demand for planned and
unplanned industrial related cleaning and maintenance services at customer sites
and environmental cleanup services on a scheduled or emergency basis, including
response to national events such as major chemical spills, natural disasters, or
other events where immediate and specialized services are required, including
our contagion disinfection, decontamination and disposal services. With the
addition of the Safety-Kleen core service offerings, (e.g. containerized waste
disposal, parts washer and vacuum services), the Environmental Services results
are further impacted by the volumes of waste collected from these customers, the
overall number of parts washers placed at customer sites and the demand for and
frequency of other offered services. In managing the business and evaluating
performance, management tracks the volumes and mix of waste handled and disposed
of or recycled, generally through our incinerators, TSDFs and landfills, the
utilization rates of our incinerators, equipment and workforce, including
billable hours, and number of parts washer services performed, among other key
metrics. Levels of activity and ultimate performance associated with this
segment can be impacted by several factors including overall U.S. GDP, U.S.
industrial production, economic conditions in the automotive, manufacturing and
other industrial markets, weather conditions, efficiency of our operations,
technology, changing regulations, competition, market pricing of our services,
costs incurred to deliver our services and the management of our related
operating costs.

•Safety-Kleen Sustainability Solutions - Safety-Kleen Sustainability Solutions
segment results are impacted by our customers' demand for high-quality,
environmentally responsible recycled oil products and their demand for our
related service offerings and products. Safety-Kleen Sustainability Solutions
offers high quality recycled base and blended oil products to end users
including fleet customers, distributors and manufacturers of oil products.
Segment results are
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impacted by overall demand as well as product mix as it relates to these oil
products. Segment results are also predicated on the demand for the Safety-Kleen
Sustainability Solutions other product and service offerings including
collection services for used oil, used oil filters and other automotive fluids.
These fluid collections are used as feedstock in our oil re-refining to make our
base and blended oil products and our recycled automotive related fluid products
or are integrated into the Clean Harbors' recycling and disposal network. In
operating the business and evaluating performance, management tracks the volumes
and relative percentages of base and blended oil sales along with various
pricing metrics associated with the commodity driven margin. Management also
tracks the volumes and pricing of used oil and automotive fluid collections.
Levels of activity and ultimate performance associated with this segment can be
impacted by economic conditions in the automotive services and manufacturing
markets, efficiency of our operations, technology, weather conditions, changing
regulations, competition, the management of our related operating costs and the
availability of raw materials including used oil and additives. Costs incurred
in connection with the collection of used oil and other raw materials associated
with the segment's oil related products can also be volatile. The overall market
price of oil and regulations that change the possible usage of used oil,
including the International Maritime Organization's 2020 regulation ("IMO 2020")
and other regulations related to the burning of used motor oil as a fuel, both
impact the premium the segment can charge for used oil collections.
Highlights

Total revenues for the three months ended March 31, 2022 were $1,169.1 million,
compared with $808.1 million for the three months ended March 31, 2021. Our
Environmental Services segment direct revenues increased $292.8 million or 44.7%
from the comparable period in 2021. Our acquisition of HydroChemPSC on October
8, 2021 contributed to increases in both our industrial services and field and
emergency response service offerings within the Environmental Services segment
with core organic growth also contributing to the overall increase. In the three
months ended March 31, 2022, our Safety-Kleen Sustainability Solutions segment
direct revenues increased $68.1 million or 44.4% from the comparable period in
2021 predominately due to higher pricing of our base and blended oil products.

In the three months ended March 31, 2022, costs have increased in both the
Environmental Services and Safety-Kleen Sustainability Solutions segments when
comparing to the prior year given the increase in business levels, revenue mix
and inflationary pressures seen across several cost categories.

We reported income from operations for the three months ended March 31, 2022 of
$87.1 million, compared with $50.9 million in the three months ended March 31,
2021, and net income for the three months ended March 31, 2022 of $45.3 million,
compared with net income of $21.7 million in the three months ended March 31,
2021. The increases in these earnings measures were 71.3% and 108.5%
respectively.

Adjusted EBITDA, which is the primary financial measure by which our segments
are evaluated, increased 39.2% to $180.3 million in the three months ended
March 31, 2022 from $129.5 million in the three months ended March 31, 2021.
This improved performance was primarily driven by the increased revenue levels
noted above, and strong spread management as it relates to the pricing of base
oil products and used motor oil collection services in the Safety-Kleen
Sustainability Solutions segment. Additional information, including a
reconciliation of Adjusted EBITDA to net income, appears below under "Adjusted
EBITDA."

Net cash used in operating activities for the three months ended March 31, 2022
was $38.6 million, as compared to net cash from operating activities of $103.0
million in the comparable period of 2021. Adjusted free cash flow, which
management uses to measure our financial strength and ability to generate cash,
was an outflow of $107.6 million in the three months ended March 31, 2022 as
compared to positive adjusted free cash flow of $62.3 million in the comparable
period of 2021. These expected decreases in our cash flows were the result of an
increase in working capital, comparatively higher incentive compensation and
interest payments and higher levels of cash spending on the acquisition of
property, plant and equipment, partially offset by higher operating income.
Additional information, including a reconciliation of adjusted free cash flow to
net cash (used in) from operating activities, appears below under "Adjusted Free
Cash Flow."

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Segment Performance



The primary financial measure by which we evaluate the performance of our
segments is Adjusted EBITDA, as described below under "Adjusted EBITDA". The
following table sets forth certain financial information associated with our
results of operations for the three months ended March 31, 2022 and March 31,
2021 (in thousands, except percentages):

                                                                                                             Summary of Operations
                                                                  For the Three Months Ended
                                                                                 March 31, 2022          March 31, 2021            Change            % Change
Direct Revenues(1):
Environmental Services                                                          $      947,445          $      654,602          $ 292,843              44.7%
Safety-Kleen Sustainability Solutions                                                  221,592                 153,467             68,125              44.4
Corporate Items                                                                             72                      79                 (7)              N/M
Total                                                                                1,169,109                 808,148            360,961              44.7
Cost of Revenues(2):
Environmental Services                                                                 685,336                 451,255            234,081              51.9
Safety-Kleen Sustainability Solutions                                                  152,017                 108,376             43,641              40.3
Corporate Items                                                                          6,036                     905              5,131               N/M
Total                                                                                  843,389                 560,536            282,853              50.5
Selling, General & Administrative Expenses:
Environmental Services                                                                  78,507                  63,093             15,414              

24.4


Safety-Kleen Sustainability Solutions                                                   17,698                  13,459              4,239              31.5
Corporate Items                                                                         54,968                  45,089              9,879              21.9
Total                                                                                  151,173                 121,641             29,532              24.3
Adjusted EBITDA:
Environmental Services                                                                 183,602                 140,254             43,348              30.9
Safety-Kleen Sustainability Solutions                                                   51,877                  31,632             20,245              64.0
Corporate Items                                                                        (55,220)                (42,435)           (12,785)            (30.1)
Total                                                                           $      180,259          $      129,451          $  50,808              39.2%
Adjusted EBITDA as a % of Direct Revenues:
Environmental Services                                                                    19.4  %                 21.4  %            (2.0) %
Safety-Kleen Sustainability Solutions                                                     23.4  %                 20.6  %             2.8  %
Corporate Items                                                                               N/M                     N/M                N/M
Total                                                                                     15.4  %                 16.0  %            (0.6) %


_____________________
N/M = not meaningful
(1)Direct revenue is revenue allocated to the segment performing the provided
service.
(2)Cost of revenue is shown exclusive of items presented separately on the
consolidated statements of operations which consist of (i) accretion of
environmental liabilities and (ii) depreciation and amortization.
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Direct Revenues



There are many factors which have impacted and continue to impact our revenues
including, but not limited to: overall levels of industrial activity and
economic growth in North America, existence or non-existence of large scale
environmental waste and remediation projects, competitive industry pricing,
miles driven and related lubricant demand, impacts of acquisitions and
divestitures, the level of emergency response services, weather related events,
base and blended oil pricing, market changes relative to the collection of used
oil, our ability to manage the spread between oil product prices and prices for
the collection of used oil, the number of parts washers placed at customer sites
and foreign currency translation. In addition, customer efforts to minimize
hazardous waste and changes in regulation can also impact our revenues.

Environmental Services

                                                               For the Three Months Ended
                                                                   March 31,                2022 over 2021
(in thousands, except percentages)                                                      2022               2021              Change             % Change

Direct revenues                                                                     $ 947,445          $ 654,602          $ 292,843                  44.7  %



Environmental Services direct revenues for the three months ended March 31, 2022
increased $292.8 million from the comparable period in 2021 driven primarily
from the incremental business from the HydroChemPSC operations within industrial
service and field and emergency response service revenues coupled with organic
growth across many service offerings. Direct revenues of our industrial service
offerings increased $184.4 million of which approximately $155.8 million was
generated by HydroChemPSC while the remainder was primarily due to increased
demand for our core industrial services. Technical services revenues increased
$63.8 million largely due to higher throughput at our facilities and increased
pricing for our disposal services. Utilization at our incinerators increased to
85% in the first quarter of 2022 largely driven by fewer down days as compared
utilization of 80% in the first quarter of 2021 when our incinerators were
impacted by significant weather events. We also saw an increase in landfill
volumes in the first quarter of 2022 as compared to the first quarter of 2021.
Field and emergency response services revenues increased approximately $27.3
million despite a $19.5 million decrease in COVID-19 decontamination service
revenues. This overall increase was both related to contributions from the
HydroChemPSC business as well as organic growth in the legacy field services
operations. Direct revenues for the Safety-Kleen core service offerings
increased $16.9 million from the comparable period in 2021 due to improved
pricing and greater demand for our containerized waste and vacuum services.

Safety-Kleen Sustainability Solutions



                                                               For the 

Three Months Ended


                                                                   March 31,                2022 over 2021
(in thousands, except percentages)                                                      2022               2021             Change             % Change

Direct revenues                                                                     $ 221,592          $ 153,467          $ 68,125                  44.4  %


Safety-Kleen Sustainability Solutions direct revenues for the three months
ended March 31, 2022 increased $68.1 million from the comparable period in 2021
predominately due to higher pricing of our base and blended oil products. Base
oil sales revenues increased approximately $50.4 million, almost all of which
was due to pricing as the volume sold was relatively flat to the comparable
period in 2021. Revenues from our blended oil products increased $11.0 million
due to pricing increases more than offsetting slightly lower volumes sold.

Cost of Revenues



We believe that our ability to manage operating costs is important to our
ability to remain price competitive. We continue to experience the current
macroeconomic inflationary pressures across several cost categories, but most
notably related to internal and external labor, transportation, general supplies
and energy related costs. We continue to manage these increases through constant
cost monitoring as well as our overall customer pricing strategies designed to
offset the negative inflationary impacts on our margins. We also continue to
upgrade the quality and efficiency of our services through the development of
new technology and continued modifications and expansion at our facilities,
invest in new business opportunities and aggressively implement strategic
sourcing and logistics solutions in the face of these inflationary pressures,
while also continuing to optimize our management and operating structure in an
effort to manage our operating margins.

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Environmental Services
                                                                   For the Three Months Ended
                                                                     March 31,                    2022 over 2021
(in thousands, except percentages)                                                           2022                   2021              Change             % Change
Cost of revenues                                                                      $           685,336       $    451,255       $ 234,081                  51.9  %
As a % of Direct revenues                                                                       72.3    %          68.9    %             3.4  %


Environmental Services cost of revenues for the three months ended March 31,
2022 increased $234.1 million from the comparable period in 2021, primarily due
to the increase in direct revenues noted above, including additional costs from
the HydroChemPSC operations. Cost of revenues as a percentage of direct revenues
increased 3.4% from the comparable period in the prior year mainly due to the
mix of services, including lower COVID-19 decontamination services and the
growth of our industrial services offerings which typically operate at margins
lower than our waste disposal focused offerings. Inflationary pressures across
several cost categories including labor, transportation, equipment and supply
costs have also contributed to the increase of these costs as a percentage of
revenues. Overall, labor and benefit related costs increased $110.1 million,
equipment and supply costs increased $67.4 million and external transportation,
vehicle and fuel related costs increased $40.4 million.

Safety-Kleen Sustainability Solutions



                                                                   For the 

Three Months Ended


                                                                     March 31,                    2022 over 2021
(in thousands, except percentages)                                                           2022                   2021              Change             % Change
Cost of revenues                                                                      $           152,017       $     108,376       $ 43,641                  40.3  %
As a % of Direct revenues                                                                       68.6    %           70.6    %           (2.0) %


Safety-Kleen Sustainability Solutions cost of revenues for the three months
ended March 31, 2022 increased $43.6 million from the comparable period in 2021.
The cost of oil additives and other raw materials increased $31.7 million,
nearly half of which was due to increased costs to obtain used oil through our
used oil collection services. The increase in base oil pricing in the first
quarter of 2022 as compared to the same period in 2021 has created a correlated
increase in the cost we now pay for used oil feedstock. Other costs that
contributed to the overall increase include the cost of external transportation,
vehicle and fuel costs which increased $4.5 million and labor and benefit
related costs which increased $2.5 million.

As a percentage of revenues, Safety-Kleen Sustainability Solutions costs of
revenues improved by 2.0% in the three months ended March 31, 2022 as compared
to the comparable period in 2021. This margin improvement was largely driven by
the increased pricing of our products which outpaced the relative cost of
revenues as the business continued to capitalize on the favorable market
conditions and manage the spread between the pricing of products and the related
costs to obtain the feedstock.

Selling, General and Administrative Expenses



We strive to manage our selling, general and administrative ("SG&A") expenses
commensurate with the overall performance of our segments and corresponding
revenue levels. We believe our ability to properly align these costs with
business performance is reflective of our strong management of the businesses
and further promotes our ability to remain competitive in the marketplace.

Environmental Services

                                                                  For the Three Months Ended
                                                                     March 31,                   2022 over 2021
(in thousands, except percentages)                                                           2022                 2021             Change             % Change
SG&A expenses                                                                         $           78,507       $    63,093       $ 15,414                  24.4  %
As a % of Direct revenues                                                                        8.3   %           9.6   %           (1.3) %


Environmental Services SG&A expenses for the three months ended March 31, 2022
increased $15.4 million from the comparable period in 2021, most predominately
due to an $11.0 million increase in labor and benefit related costs. The
increased costs from the HydroChemPSC business operations drove a significant
portion of the increase. As a percentage of revenue, however, the Environmental
Services SG&A improved by 1.3%.

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Safety-Kleen Sustainability Solutions



                                                                  For the 

Three Months Ended


                                                                     March 31,                   2022 over 2021
(in thousands, except percentages)                                                           2022                 2021             Change            % Change
SG&A expenses                                                                         $           17,698       $    13,459       $ 4,239                  31.5  %
As a % of Direct revenues                                                                        8.0   %           8.8   %          (0.8) %


Safety-Kleen Sustainability Solutions SG&A expenses for the three months ended
March 31, 2022 increased $4.2 million from the comparable periods in 2021
primarily attributable to the increases in direct revenues noted above. As a
percentage of revenues, these costs remained relatively consistent in the three
months ended March 31, 2022 when compared to the same period in the prior year.
Overall, $3.4 million of the increase was specifically associated with labor and
benefit related costs.

Corporate Items

                                                               For the Three Months Ended
                                                                   March 31,               2022 over 2021
(in thousands, except percentages)                                                     2022              2021             Change            % Change
SG&A expenses                                                                       $ 54,968          $ 45,089          $ 9,879                  21.9  %
As a % of Total Clean Harbors' Direct revenues                                           4.7  %            5.6  %          (0.9) %


We manage our Corporate Items SG&A expenses commensurate with the overall total
Company performance and direct revenue levels. Generally, as revenues increase,
we would expect some increase in these costs. Corporate Items SG&A expenses for
the three months ended March 31, 2022 increased $9.9 million from the comparable
period in 2021, however decreased as a percentage of total Clean Harbors' direct
revenues. Overall, cost increases included a $6.2 million increase in labor and
benefits related costs, including higher human resources related expenses,
incentive compensation and stock based compensation costs. The higher stock
based compensation costs are primarily driven by the timing of grants in 2022 as
well as overall achievement of performance based awards. These increases were
partially offset by the $3.0 million breakup fee received related to the
termination of the proposed asset acquisition from Vertex Energy, Inc. The
remaining net increase is spread across various cost categories.

Adjusted EBITDA



Management considers Adjusted EBITDA to be a measurement of performance which
provides useful information to both management and investors. Adjusted EBITDA
should not be considered an alternative to net income or other measurements
under GAAP. Adjusted EBITDA is not calculated identically by all companies and
therefore our measurements of Adjusted EBITDA, while defined consistently and in
accordance with our existing credit agreement, may not be comparable to
similarly titled measures reported by other companies.

                                                                      For 

the Three Months Ended


                                                                          March 31,                2022 over 2021
(in thousands, except percentages)                                                             2022               2021             Change             % Change
Adjusted EBITDA:
Environmental Services                                                                     $ 183,602          $ 140,254          $ 43,348                  30.9  %
Safety-Kleen Sustainability Solutions                                                         51,877             31,632            20,245                  64.0
Corporate Items                                                                              (55,220)           (42,435)          (12,785)                (30.1)
Total                                                                                      $ 180,259          $ 129,451          $ 50,808                  39.2  %


We use Adjusted EBITDA to enhance our understanding of our operating
performance, which represents our views concerning our performance in the
ordinary, ongoing and customary course of our operations. We historically have
found it helpful, and believe that investors have found it helpful, to consider
an operating measure that excludes certain expenses relating to transactions not
reflective of our core operations.

The information about our operating performance provided by this financial
measure is used by our management for a variety of purposes. We regularly
communicate Adjusted EBITDA results to our lenders since our loan covenants are
based upon levels of Adjusted EBITDA achieved and to our board of directors and
we discuss our interpretation of such results with the board. We also compare
our Adjusted EBITDA performance against internal targets as a key factor in
determining cash and stock bonus

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compensation for executives and other employees, largely because we believe that
this measure is indicative of how the fundamental business is performing and is
being managed.

We also provide information relating to our Adjusted EBITDA so that analysts,
investors and other interested persons have the same data that we use to assess
our core operating performance. We believe that Adjusted EBITDA should be viewed
only as a supplement to the GAAP financial information. We also believe,
however, that providing this information in addition to, and together with, GAAP
financial information permits the users of our financial statements to obtain a
better understanding of our core operating performance and to evaluate the
efficacy of the methodology and information used by management to evaluate and
measure such performance on a standalone and a comparative basis.

The following is a reconciliation of net income to Adjusted EBITDA for the following periods (in thousands, except percentages):



                                                     For the Three Months Ended
                                                             March 31,
                                                                           2022            2021
Net income                                                             $  45,314       $  21,736
Accretion of environmental liabilities                                     3,156           2,953
Stock-based compensation                                                   5,712           3,480
Depreciation and amortization                                             84,298          72,163
Other (income) expense, net                                                 (704)          1,228
Interest expense, net of interest income                                  25,017          17,918
Provision for income taxes                                                17,466           9,973
Adjusted EBITDA                                                        $ 180,259       $ 129,451
As a % of Direct revenues                                                   15.4  %         16.0  %


Depreciation and Amortization

                                                              For the Three Months Ended
                                                                  March 31,               2022 over 2021
(in thousands, except percentages)                                                    2022              2021             Change             % Change
Depreciation of fixed assets and amortization of
landfills and finance leases                                                       $ 72,058          $ 64,574          $  7,484                  11.6  %
Permits and other intangibles amortization                                           12,240             7,589             4,651                  61.3
Total depreciation and amortization                                                $ 84,298          $ 72,163          $ 12,135                  16.8  %


Depreciation and amortization for the three months ended March 31, 2022 increased by $12.1 million from the comparable periods in 2021 due the depreciation and amortization of the HydroChemPSC tangible and intangible assets which were acquired in in the fourth quarter of 2021.

Provision for Income Taxes



                                                               For the 

Three Months Ended


                                                                   March 31,               2022 over 2021
                                                                                                                                              %
(in thousands, except percentages)                                                     2022              2021            Change            Change
Provision for income taxes                                                          $ 17,466          $ 9,973          $ 7,493                75.1  %
Effective tax rate                                                                      27.8  %          31.5  %          (3.7) %


The provision for income taxes for the three months ended March 31, 2022
increased $7.5 million from the comparable period in 2021, due to an increase in
income before provision for income taxes. Our effective tax rate for the three
months ended March 31, 2022 decreased 3.7% when compared to the three months
ended March 31, 2021. The decrease in our effective tax rate is largely due a
decrease in unbenefited losses in certain of our Canadian entities.

In recent periods, certain Canadian entities which have historically generated
net operating losses and for which we have recognized valuation allowances, have
been operating at a profit. This recent profitability is due to operational
improvements, tax strategies and government subsidies. As of March 31, 2022, we
do not yet believe that sufficient positive evidence exists to support

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that this return to profitability will continue for a sustained period. We will
continue to evaluate this on an ongoing basis to determine when, if at all, to
release some or all of the associated remaining valuation allowances.

Liquidity and Capital Resources



We assess our liquidity in terms of our ability to generate cash to fund our
operating, investing, and financing activities. Our primary ongoing cash
requirements will be to fund operations, capital expenditures, interest payments
and investments in line with our business strategy. We believe our future
operating cash flows will be sufficient to meet our future operating and
internal investing cash needs. We monitor our actual needs and forecasted cash
flows, our liquidity and our capital resources, enabling us to plan our present
needs and fund items that may arise during the year as a result of changing
business conditions or opportunities. Furthermore, our existing cash balance and
the availability of additional borrowings under our revolving credit facility
provide additional potential sources of liquidity should they be required.

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