math
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5 defs 18 6 defs 16 3 defs 28 5 defs 26 3 defs 23 5 defs 16 5 defs 21 7 defs 21 3 defs 27 3 defs 17 7 defs 19 3 defs 18 2 defs 15 3 defs 16 5 defs 16 5 defs 17 6 defs 23 3 defs 15 3 defs 16 3 defs 15 3 defs 16 6 defs 26 3 defs 15 6 defs 17 4 defs 26 5 defs 23 6 defs 19 4 defs 15 7 defs 16 3 defs 18