Explanation of Responses:
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1. These transactions were effected pursuant to a Rule 10b5-1 trading plan.
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2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $181.04 to $182.00, inclusive. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) through (11) of this Form 4.
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3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $182.05 to $183.03, inclusive.
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4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $183.06 to $183.97, inclusive.
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5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $184.13 to $184.99, inclusive.
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6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $185.24 to $186.13, inclusive.
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7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $186.32 to $187.17, inclusive.
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8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $187.32 to $188.28, inclusive.
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9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $188.43 to $189.39, inclusive.
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10. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $189.42 to $190.37, inclusive.
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11. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $190.50 to $190.80, inclusive.
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12. The shares are held of record by General Catalyst Group VI, L.P., or GC Group VI LP. General Catalyst GP VI, LLC, or GP VI LLC, is the general partner of General Catalyst Partners VI, L.P., which is the general partner of GC Group VI LP. General Catalyst Group Management Holdings, L.P., or GCGMH, is the manager of General Catalyst Group Management, LLC, or GCGM, which is the manager of GP VI LLC. As a Managing Member of General Catalyst Group Management Holdings GP, LLC, or GCGMH LLC, the general partner of GCGMH, the reporting person shares voting and investment power with respect to shares held by GC Group VI LP. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest in such securities.
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13. 10,616 shares are held by 7wire Investment Holdings, Ltd., or 7wire, which is wholly owned by General Catalyst Group VIII, L.P., or GC Group VIII LP, and the balance are held by GC Group VIII LP. General Catalyst GP VIII, LLC, or GP VIII LLC, is the general partner of General Catalyst Partners VIII, L.P., or GP VIII LP, which is the general partner of GC Group VIII LP. GCGM, is the manager of GP VIII LLC. GCGMH, is the manager of GCGM. As a Managing Member of GCGMH LLC, the general partner of GCGMH, the reporting person shares voting and investment power with respect to shares held by 7wire and GC Group VIII LP. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest in such securities.
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14. The shares are held of record by General Catalyst Group VIII Supplemental, L.P., or GC Group VIII Supplemental. GP VIII LLC is the general partner of GP VIII LP, which is the general partner of GC Group VIII Supplemental. GCGMH is the manager of GCGM, which is the manager of GP VIII LLC. As a Managing Member of GCGMH LLC, the general partner of GCGMH, the reporting person shares voting and investment power with respect to shares held by GC Group VIII Supplemental. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest in such securities.
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15. These shares are held of record by GCGM Investment Holdings, LP, or GCGM IH. As a Managing Member of GCGMH LLC, the general partner of GCGM IH, the reporting person shares voting and investment power with respect to shares held by GCGM IH. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest in such securities.
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