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10 questions

1Trips and UsersHard
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2Hopper Company Queries IIIHard
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3Hopper Company Queries IIHard
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4Hopper Company Queries IHard
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5Human Traffic of StadiumHard
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6Trips and UsersHard
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7Hopper Company Queries IHard
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8Hopper Company Queries IIHard
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9Hopper Company Queries IIIHard
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10Human Traffic of StadiumHard
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