def gce_zones() -> list:
    """Returns the list of GCE zones"""
    _bcds = dict.fromkeys(['us-east1', 'europe-west1'], ['b', 'c', 'd'])
    _abcfs = dict.fromkeys(['us-central1'], ['a', 'b', 'c', 'f'])
    _abcs = dict.fromkeys(
        [
            'us-east4',
            'us-west1',
            'europe-west4',
            'europe-west3',
            'europe-west2',
            'asia-east1',
            'asia-southeast1',
            'asia-northeast1',
            'asia-south1',
            'australia-southeast1',
            'southamerica-east1',
            'asia-east2',
            'asia-northeast2',
            'europe-north1',
            'europe-west6',
            'northamerica-northeast1',
            'us-west2',
        ],
        ['a', 'b', 'c'],
    )
    _zones_combo = {**_bcds, **_abcfs, **_abcs}
    zones = [f'{loc}-{zone}' for loc, zones in _zones_combo.items() for zone in zones]
    return zones