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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 set_state(seed_value=None, step=None):
 """Set random seed."""

    global RANDOM_SEED  # pylint: disable=global-statement
    if seed_value is not None:
        RANDOM_SEED = seed_value
    if step is not None:
        RANDOM_SEED += step