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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_parameter_lists(*parameter_definitions):
 """ Merge multiple lists of parameters into a single list. If there are any duplicate definitions, the last write wins. """

    merged_parameters = {}
    for parameter_list in parameter_definitions:
        for parameter in parameter_list:
            key = (parameter['name'], parameter['in'])
            merged_parameters[key] = parameter
    return merged_parameters.values()