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[
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{
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"_id": 1,
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"title": "最初的最初 - A+B Problem",
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"requireNids": [],
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"pids": [1000, "56c52ade2fefd90539000005"]
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},
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{
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"_id": 2,
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"title": "最初的进阶",
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"requireNids": [1],
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"pids": [1001, 1002]
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}
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]
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