code: def simplify(answer):
      return set(
          "".join(c for c in t if c not in string.punctuation)
          for t in answer.strip().lower().split()
      ) - {"the", "a", "an", "and", ""}
  
imports: from subprocess import Popen, PIPE, CalledProcessError
  import json
  from text.torchtext.datasets.generic import Query
  import logging
  import os
  import re
  import string
  import numpy
  import collections
  from multiprocessing import Pool, cpu_count
  from contextlib import closing
  from pyrouge import Rouge155
  from sacrebleu import corpus_bleu
label_desc: Use image node_id 4 for calling a global function with example usage: simplify(answer) and returns: unknown