Add submissions/2017-12 (22 shards, 10.6M rows)

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data/submissions/2017/12/011.parquet

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data/submissions/2017/12/013.parquet

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data/submissions/2017/12/014.parquet

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data/submissions/2017/12/015.parquet

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data/submissions/2017/12/016.parquet

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data/submissions/2017/12/018.parquet

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data/submissions/2017/12/019.parquet

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