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After running 2to3
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@ -12,8 +12,8 @@ def choose(n, r):
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return 0
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if r == 0:
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return 1
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denom = reduce(op.mul, xrange(1, r + 1), 1)
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numer = reduce(op.mul, xrange(n, n - r, -1), 1)
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denom = reduce(op.mul, range(1, r + 1), 1)
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numer = reduce(op.mul, range(n, n - r, -1), 1)
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return numer // denom
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# Just to have a less heavyweight name for this extremely common operation
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