math
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3 defs 20 6 defs 17 5 defs 20 6 defs 30 6 defs 20 2 defs 15 6 defs 16 7 defs 22 6 defs 22 7 defs 27 6 defs 29 5 defs 25 6 defs 29 6 defs 19 5 defs 30 7 defs 24 6 defs 28 7 defs 21 5 defs 28 3 defs 14 5 defs 24 6 defs 21 6 defs 20 5 defs 21 6 defs 25 3 defs 29 6 defs 17 6 defs 16 3 defs 18 6 defs 21