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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 all_network_files():
 """All network files"""

    # TODO: list explicitly since some are missing?
    network_types = [
        'AND-circle',
        'MAJ-specialized',
        'MAJ-complete',
        'iit-3.0-modular'
    ]
    network_sizes = range(5, 8)
    network_files = []
    for n in network_sizes:
        for t in network_types:
            network_files.append('{}-{}'.format(n, t))
    return network_files