cython

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# mode: run
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# ticket: t712
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def single_from_string():
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    """
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    >>> print(single_from_string())
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    a
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    """
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    (a,) = 'a'
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    return a
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def single_from_set():
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    """
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    >>> print(single_from_set())
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    a
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    """
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    (a,) = set(["a"])
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    return a
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