code: def _attempt_proof_n_eq(
      self, current, context, agenda, accessible_vars, atoms, debug
  ):
      ###########################################################################
      # Since 'current' is of type '~(a=b)', the path is closed if 'a' == 'b'
      ###########################################################################
      if current.term.first == current.term.second:
          debug.line("CLOSED", 1)
          return True
  
      agenda[Categories.N_EQ].add((current, context))
      current._exhausted = True
      return self._attempt_proof(
          agenda,
          accessible_vars | {current.term.first, current.term.second},
          atoms,
          debug + 1,
      )
  
imports: from nltk.inference.api import BaseProverCommand, Prover
  from nltk.internals import Counter
  from nltk.sem.logic import AbstractVariableExpression, AllExpression, AndExpression, ApplicationExpression, EqualityExpression, ExistsExpression, Expression, FunctionVariableExpression, IffExpression, ImpExpression, LambdaExpression, NegatedExpression, OrExpression, Variable, VariableExpression, unique_variable
label_desc: Use image node_id 9 for calling the TableauProver obj's underlying member method code with example usage: obj._attempt_proof_n_eq(current, context, agenda, accessible_vars, atoms, debug) and returns: self, True