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@ -55,6 +55,13 @@ def advance(iterable, num):
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return iterator
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return iterator
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def repeat(times):
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"""Return an iterator that returns None"""
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if times < 0:
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return itertools.repeat(None)
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return itertools.repeat(None, times)
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def unique(iterable):
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def unique(iterable):
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"""Yield unique elements from 'iterable' while preserving order"""
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"""Yield unique elements from 'iterable' while preserving order"""
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seen = set()
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seen = set()
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