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@@ -30,7 +30,7 @@ class Codec:
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r = v % len(alphabets[idx])
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r = v % len(alphabets[idx])
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v = int(v / len(alphabets[idx]))
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v = int(v / len(alphabets[idx]))
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st = alphabets[idx][r] + st
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st = alphabets[idx][r] + st
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- idx = (idx - 1) % numalpha
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+ idx = (idx + numalpha - 1) % numalpha
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length += 1
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length += 1
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return st
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return st
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