question: When did the second book, The Sea of Monsters, from the Percy Jackson series come out?
answerText: It came out in April 1, 2007.
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questionEntity.entityType: entity
questionEntity.label: Percy Jackson
questionEntity.mention: Percy Jackson
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questionEntity.label: The Sea of Monsters
questionEntity.mention: The Sea of Monsters,
questionEntity.name: 2
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questionEntity.mention: second