code: def _attempt_proof_some(
      self, current, context, agenda, accessible_vars, atoms, debug
  ):
      new_unique_variable = VariableExpression(unique_variable())
      agenda.put(
          current.term.replace(current.variable, new_unique_variable),
          context,
      )
      agenda.mark_alls_fresh()
      return self._attempt_proof(
          agenda,
          accessible_vars | {new_unique_variable},
          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 22 for calling the TableauProver obj's underlying member method code with example usage: obj._attempt_proof_some(current, context, agenda, accessible_vars, atoms, debug) and returns: self