code: def main():
      """Print the duplicate-free result in stdout."""
      parser = argparse.ArgumentParser()
      parser.add_argument(
          "index_file",
          type=str,
          help="Kaldi-style utterance-indexed file path.",
      )
      args = parser.parse_args()
  
      read_2columns_text(args.index_file)
  
imports: import argparse
  from pathlib import Path
label_desc: Use image node_id 2 for calling a global function with example usage: main() without return types