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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 render_subcommand(args):
 """Render a subcommand for human-centric viewing"""

    if args.subcommand == 'delete':
        return 'delete ' + args.delete_subcommand

    if args.subcommand in ('wal-prefetch', 'wal-push', 'wal-fetch'):
        return None

    return args.subcommand