code: def main(args):
      if args.seed:
          random.seed(args.seed)
  
      for line in sys.stdin:
          constraints = []
  
          def add_constraint(constraint):
              constraints.append(constraint)
  
          source = line.rstrip()
          if "\t" in line:
              source, target = line.split("\t")
              if args.add_sos:
                  target = f"<s> {target}"
              if args.add_eos:
                  target = f"{target} </s>"
  
              if len(target.split()) >= args.len:
                  words = [target]
  
                  num = args.number
  
                  choices = {}
                  for i in range(num):
                      if len(words) == 0:
                          break
                      segmentno = random.choice(range(len(words)))
                      segment = words.pop(segmentno)
                      tokens = segment.split()
                      phrase_index = random.choice(range(len(tokens)))
                      choice = " ".join(
                          tokens[
                              phrase_index : min(
                                  len(tokens), phrase_index + args.len
                              )
                          ]
                      )
                      for j in range(
                          phrase_index,
                          min(len(tokens), phrase_index + args.len),
                      ):
                          tokens.pop(phrase_index)
                      if phrase_index > 0:
                          words.append(" ".join(tokens[0:phrase_index]))
                      if phrase_index + 1 < len(tokens):
                          words.append(" ".join(tokens[phrase_index:]))
                      choices[target.find(choice)] = choice
  
                      # mask out with spaces
                      target = target.replace(
                          choice, " " * len(choice), 1
                      )
  
                  for key in sorted(choices.keys()):
                      add_constraint(choices[key])
  
          print(source, *constraints, sep="\t")
  
imports: import argparse
  import random
  import sys
label_desc: Use image node_id 2 for calling a global function with example usage: main(args) without return types