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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 path_ok(match_tuple: MatchTuple) -> bool: """Check if a file in this repository exists."""

    relative_path = match_tuple.link.split("#")[0]
    full_path = os.path.join(os.path.dirname(str(match_tuple.source)), relative_path)
    return os.path.exists(full_path)