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I am Number of pairs (c, y) where c is an integer composition and y is an integer partition and y can be obtained from c by choosing a partition of each part, flattening, and sorting.
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7of9(0x70f9=28921) (7of9@qiitadon.com)'s status on Thursday, 18-Oct-2018 21:12:04 JST 7of9(0x70f9=28921) - ( ᐛ) まりなっピ and カバ repeated this.