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@@ -0,0 +1,38 @@
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+#!/usr/bin/python
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+
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+from string import ascii_lowercase
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+from itertools import takewhile
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+import re
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+
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+input = 'cqjxjnds'
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+
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+run_regex = '|'.join(ascii_lowercase[i:i+3] for i in range(24))
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+next_letter = dict((l, chr(ord(l) + 1)) for l in ascii_lowercase)
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+next_letter['h'] = 'j'
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+next_letter['n'] = 'p'
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+next_letter['k'] = 'm'
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+next_letter['z'] = 'a'
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+
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+
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+def increment(str):
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+ tail = sum(1 for _ in takewhile(lambda x: x == 'z', str[::-1]))
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+ next = list(str)
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+ if tail < len(next):
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+ next[-tail - 1] = next_letter[next[-tail - 1]]
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+ if tail > 0:
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+ next[-tail:] = 'a' * tail
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+ return ''.join(next)
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+
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+
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+def matches(str):
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+ has_run = re.search(run_regex, str)
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+ has_bad_letters = re.search('[iol]', str)
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+ has_pairs = re.search(r'(.)(\1).*?(?!\1)(.)(\3)', str)
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+ return has_run and has_pairs and not has_bad_letters
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+
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+
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+for _ in range(2):
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+ input = increment(input)
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+ while not matches(input):
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+ input = increment(input)
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+ print(input)
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