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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 merge_bytes(binder_strings):
 """Concatenate multiple serialized binders into one byte string."""

    output = None
    for byte_string in binder_strings:
        binder = Binder().from_bytes(byte_string)
        if output is None:
            output = binder
        else:
            output.merge(binder)
    return output.to_bytes()