code: def test_config():
      a = Expression.fromstring("(walk(j) & sing(j))")
      g = Expression.fromstring("walk(j)")
      p = Prover9Command(g, assumptions=[a])
      p._executable_path = None
      p.prover9_search = []
      p.prove()
      # config_prover9('/usr/local/bin')
      print(p.prove())
      print(p.proof())
  
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 3 for calling a global function with example usage: test_config() without return types