math
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5 defs 17 5 defs 16 6 defs 14 6 defs 18 3 defs 17 3 defs 12 5 defs 16 3 defs 13 3 defs 13 6 defs 15 3 defs 10 3 defs 15 3 defs 11 7 defs 18 3 defs 12 3 defs 17 3 defs 14 2 defs 13 3 defs 14 6 defs 16 5 defs 20 6 defs 17 3 defs 24 5 defs 15 7 defs 20 3 defs 12 6 defs 12 3 defs 11 3 defs 19 7 defs 15