math
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6 defs 17 5 defs 15 5 defs 21 5 defs 21 6 defs 19 7 defs 28 5 defs 22 6 defs 16 5 defs 23 3 defs 17 6 defs 24 6 defs 20 5 defs 19 6 defs 22 6 defs 23 2 defs 14 3 defs 13 5 defs 31 7 defs 16 2 defs 19 3 defs 15 6 defs 23 5 defs 18 3 defs 22 6 defs 22 3 defs 16 6 defs 19 3 defs 16 3 defs 16 6 defs 18