Explanation of Responses:
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1. Gifts to charitable organizations.
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2. The transaction reported in this Form 4 was effected automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person at least 90 days prior to the trading date.
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3. Shares held in The G. Parker Harris III & Holly L. Johnson Family Trust.
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4. Weighted average price. These shares were sold in multiple transactions at prices ranging from $228.8400 to $229.0000 inclusive. The reporting person undertakes to provide 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 sold at each separate price within the range set forth above.
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5. Weighted average price. These shares were sold in multiple transactions at prices ranging from $230.9000 to $231.8400 inclusive. The reporting person undertakes to provide 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 sold at each separate price within the range set forth above.
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6. Weighted average price. These shares were sold in multiple transactions at prices ranging from $231.9300 to $232.6600 inclusive. The reporting person undertakes to provide 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 sold at each separate price within the range set forth above.
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7. Weighted average price. These shares were sold in multiple transactions at prices ranging from $233.0200 to $233.2300 inclusive. The reporting person undertakes to provide 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 sold at each separate price within the range set forth above.
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8. Weighted average price. These shares were sold in multiple transactions at prices ranging from $228.9900 to $229.0000 inclusive. The reporting person undertakes to provide 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 sold at each separate price within the range set forth above.
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9. Shares held in The G. Parker Harris III Family Trust under the G. Parker Harris, III Grantor Retained Annuity Trust, dated December 19, 2003.
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10. Weighted average price. These shares were sold in multiple transactions at prices ranging from$230.7700 to $231.7200 inclusive. The reporting person undertakes to provide 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 sold at each separate price within the range set forth above.
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11. Weighted average price. These shares were sold in multiple transactions at prices ranging from $231.7900 to $232.5000 inclusive. The reporting person undertakes to provide 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 sold at each separate price within the range set forth above.
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12. Weighted average price. These shares were sold in multiple transactions at prices ranging from $232.9300 to $233.3800 inclusive. The reporting person undertakes to provide 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 sold at each separate price within the range set forth above.
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13. Weighted average price. These shares were sold in multiple transactions at prices ranging from $229.0000 to $229.6300 inclusive. The reporting person undertakes to provide 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 sold at each separate price within the range set forth above.
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14. Shares held in The Holly L. Johnson Family Trust under the Holly L. Johnson Grantor Retained Annuity Trust, dated December 19, 2003.
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15. Weighted average price. These shares were sold in multiple transactions at prices ranging from $230.7700 to $231.7600 inclusive. The reporting person undertakes to provide 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 sold at each separate price within the range set forth above.
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16. Weighted average price. These shares were sold in multiple transactions at prices ranging from $231.7900 to $232.5000 inclusive. The reporting person undertakes to provide 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 sold at each separate price within the range set forth above.
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17. Weighted average price. These shares were sold in multiple transactions at prices ranging from $232.9300 to $233.3800 inclusive. 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 sold at each separate price within the range set forth above.
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18. Shares held in The G. Parker Harris III Exempt GST Family Trust.
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19. Shares held in The Holly L. Johnson Exempt GST Family Trust.
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20. Option vests over four years at the rate of 25% on November 25, 2015, the first anniversary of the holder's date of grant, with the balance vesting in equal monthly installments over the remaining 36 months.
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