math
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5 defs 13 3 defs 20 3 defs 10 5 defs 11 6 defs 16 3 defs 14 6 defs 16 3 defs 15 5 defs 18 3 defs 13 3 defs 10 3 defs 13 3 defs 12 7 defs 16 5 defs 12 2 defs 9 2 defs 10 3 defs 17 6 defs 12 6 defs 16 3 defs 14 7 defs 10 6 defs 15 6 defs 15 3 defs 9 6 defs 14 3 defs 13 3 defs 11 5 defs 12 2 defs 11