code: def test_convert_to_prover9(expr):
      """
      Test that parsing works OK.
      """
      for t in expr:
          e = Expression.fromstring(t)
          print(convert_to_prover9(e))
  
imports: import os
  import subprocess
  import nltk
  from nltk.inference.api import BaseProverCommand, Prover
  from nltk.sem.logic import AllExpression, AndExpression, EqualityExpression, ExistsExpression, Expression, IffExpression, ImpExpression, NegatedExpression, OrExpression
label_desc: Use image node_id 4 for calling a global function with example usage: test_convert_to_prover9(expr) without return types