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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 transform_multiple(sequence, transformations, iterations):
 """Chains a transformation a given number of times. Args: sequence (str):
 a string or generator onto which transformations are applied transformations (dict):
 a dictionary mapping each char to the string that is substituted for it when the rule is applied iterations (int):
 how many times to repeat the transformation Yields: str: the next character in the output sequence. """

    for _ in range(iterations):
        sequence = transform_sequence(sequence, transformations)
    return sequence