code: def line(self, data, indent=0):
      if isinstance(data, tuple):
          ex, ctx = data
          if ctx:
              data = f"{ex}, {ctx}"
          else:
              data = "%s" % ex
  
          if isinstance(ex, AllExpression):
              try:
                  used_vars = "[%s]" % (
                      ",".join(
                          "%s" % ve.variable.name
                          for ve in ex._used_vars
                      )
                  )
                  data += ":   %s" % used_vars
              except AttributeError:
                  data += ":   []"
  
      newline = "{}{}".format("   " * (self.indent + indent), data)
      self.lines.append(newline)
  
      if self.verbose:
          print(newline)
  
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 3 for calling the Debug obj's underlying member method code with example usage: obj.line(data, indent) without return types