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# Source code for xonsh.lib.string

    from collections.abc import Iterable

    def commonprefix(m: Iterable[str]) -> str:
        """Given an iterable of strings, returns the longest common leading substring"""
        m = list(m)
        if not m:
            return ""
        s1 = min(m)
        s2 = max(m)
        for i, c in enumerate(s1):
            if c != s2[i]:
                return s1[:i]
        return s1