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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 add_validate(subparsers):
 """Validate Spinnaker setup."""

    validate_parser = subparsers.add_parser(
        'validate', help=add_validate.__doc__, formatter_class=argparse.ArgumentDefaultsHelpFormatter)
    validate_parser.set_defaults(func=validate_parser.print_help)

    validate_subparsers = validate_parser.add_subparsers(title='Testers')

    validate_all_parser = validate_subparsers.add_parser(
        'all', help=validate.validate_all.__doc__, formatter_class=argparse.ArgumentDefaultsHelpFormatter)
    validate_all_parser.set_defaults(func=validate.validate_all)

    validate_gate_parser = validate_subparsers.add_parser(
        'gate', help=validate.validate_gate.__doc__, formatter_class=argparse.ArgumentDefaultsHelpFormatter)
    validate_gate_parser.set_defaults(func=validate.validate_gate)