math
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5 defs 18 3 defs 17 3 defs 20 5 defs 18 5 defs 15 5 defs 16 5 defs 20 5 defs 14 6 defs 20 6 defs 14 6 defs 17 3 defs 14 6 defs 17 6 defs 15 6 defs 18 6 defs 15 3 defs 20 4 defs 16 6 defs 21 5 defs 20 2 defs 31 6 defs 21 6 defs 14 4 defs 25 3 defs 15 3 defs 15 7 defs 16 6 defs 17 4 defs 16 6 defs 17