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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def str_if_nested_or_str(s):
 """Turn input into a native string if possible."""

    if isinstance(s, ALL_STRING_TYPES):
        return str(s)
    if isinstance(s, (list, tuple)):
        return type(s)(map(str_if_nested_or_str, s))
    if isinstance(s, (dict, )):
        return stringify_dict_contents(s)
    return s