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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 apply_to_transcript_if_exists(effect, fn, default):
 """ Apply function to transcript associated with effect, if it exists, otherwise return default. """

    return apply_to_field_if_exists(
        effect=effect,
        field_name="transcript",
        fn=fn,
        default=default)