Explanation of Responses:
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1)
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The sales were effected pursuant to the Reporting Person's Rule 10b5-1 trading plan.
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2)
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The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $96.63 to $97.62, inclusive. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.
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3)
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The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $97.63 to $98.60, inclusive. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.
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4)
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The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $98.68 to $99.56, inclusive. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.
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5)
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The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $99.79 to $100.78, inclusive. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.
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6)
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The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $101.16 to $101.63, inclusive. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.
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7)
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The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $102.28 to $102.30, inclusive. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.
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8)
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1/48th of the shares subject to the option vest on each monthly anniversary measured from May 15, 2013 (the "Vesting Commencement Date"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date.
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9)
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The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $97.43 to $98.42, inclusive. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.
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10)
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The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $98.43 to $99.3447, inclusive. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.
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11)
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1/48th of the shares subject to the option vest on each monthly anniversary measured from November 5, 2014 (the "Vesting Commencement Date"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date.
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12)
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The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $95.02 to $96.01, inclusive. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.
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13)
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The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $96.02 to $96.96, inclusive. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.
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14)
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Shares held by Catherine Q. DeMane Trustee, Michael F. DeMane 2012 Irrevocable Trust U/A/D July 26, 2012.
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15)
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Shares held by The Michael F. DeMane 2013 Retained Annuity Trust.
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16)
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1/48th of the shares subject to the option vest on each monthly anniversary measured from November 5, 2015 (the "Vesting Commencement Date"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date.
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