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Explanation of Responses:
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1)
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Represents shares acquired by certain of the Berkshire Entities (as defined below), consistent with their investment objective of achieving capital appreciation by investing primarily in marketable securities. This Form 4 has been filed because the Reporting Person is a director of the Issuer and a managing member of, or managing member of the general partner of, each of the Berkshire Entities. As such, the Reporting Person may be deemed to have shared voting and/or dispositive power over the shares held by the Berkshire Entities. However, the Reporting Person disclaims beneficial ownership of such shares, except to the extent of his pecuniary interest therein.
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2)
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Represents shares acquired by Stockbridge Partners LLC ("SP") and held on behalf of a managed account over which it has shared voting and sole dispositive power. This Form 4 has been filed because the Reporting Person is a director of the Issuer and a managing member of SP. As such, the Reporting Person may be deemed to have shared voting and/or dispositive power over the shares held by Stockbridge Partners LLC. However, the Reporting Person disclaims beneficial ownership of these shares, except to the extent of his pecuniary interest, if any, therein.
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3)
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Owned by Berkshire Fund VII, L.P. ("VII"), Berkshire Fund VII-A, L.P. ("VII-A"), Berkshire Fund VIII, L.P. ("VIII"), Berkshire Fund VIII-A, L.P. ("VIII-A"), Berkshire Investors LLC ("Investors"), Berkshire Investors III LLC ("Investors III"), Berkshire Investors IV LLC ("Investors IV"), Stockbridge Fund, L.P. ("SF"), Stockbridge Absolute Return Fund, L.P. ("SARF") and Stockbridge Master Fund (OS), L.P. ("SOS") (collectively, the "Berkshire Entities"). Berkshire Partners Holdings LLC ("BPH") is the general partner of BPSP, L.P. ("BPSP"), which is the managing member of each of Berkshire Partners LLC, the registered investment adviser to VII, VII-A, VIII, VIII-A, Investors, Investors III, Investors IV ("BP") and SP, the registered investment adviser to SF, SARF and SOS. Seventh Berkshire Associates LLC ("7BA") is the general partner of each of VII and VII-A.
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4)
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(Continued from footnote 3): Eighth Berkshire Associates LLC ("8BA") is the general partner of each of VIII and VIII-A. Stockbridge Associates LLC ("SA") is the general partner of SF, SARF and SOS.
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5)
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The Reporting Person is a managing member of each of BPH, BPSP, BP, SP, 8BA, 7BA, SA, Investors, Investors III and Investors IV. As such, the Reporting Person may be deemed to have shared voting and/or dispositive power over the shares held by such entities. However, the Reporting Person disclaims beneficial ownership of these shares, except to the extent of his pecuniary interest therein.
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6)
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The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $184.9900 to $185.9899. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.
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7)
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The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $185.9900 to $186.9899. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.
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8)
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The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $186.9900 to $187.9899. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.
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9)
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The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $187.9900 to $188.9899. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.
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10)
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The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $188.9900 to $189.9899. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.
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11)
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The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $189.9900 to $190.6800. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.
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12)
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The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $190.7400 to $191.7399. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.
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13)
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The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $191.7400 to $192.7399. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.
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14)
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The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $192.7400 to $193.7399. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.
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15)
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The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $193.7400 to $194.7399. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.
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16)
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The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $194.7400 to $195.7399. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.
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17)
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The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $195.7400 to $195.7500. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.
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18)
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The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $196.3600 to $197.3599. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.
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19)
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The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $197.3600 to $198.3599. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.
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20)
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The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $198.3600 to $199.3599. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote.
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