Number of bits in binary representation of the positive integer n, or 0 if n == 0.
(n, correction = {
'0': 4, '1': 3, '2': 2, '3': 2,
'4': 1, '5': 1, '6': 1, '7': 1,
'8': 0, '9': 0, 'a': 0, 'b': 0,
'c': 0, 'd': 0, 'e': 0, 'f': 0})
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