code: def folmodel(quiet=False, trace=None):
      """Example of a first-order model."""
  
      global val2, v2, dom2, m2, g2
  
      v2 = [
          ("adam", "b1"),
          ("betty", "g1"),
          ("fido", "d1"),
          ("girl", {"g1", "g2"}),
          ("boy", {"b1", "b2"}),
          ("dog", {"d1"}),
          (
              "love",
              {("b1", "g1"), ("b2", "g2"), ("g1", "b1"), ("g2", "b1")},
          ),
      ]
      val2 = Valuation(v2)
      dom2 = val2.domain
      m2 = Model(dom2, val2)
      g2 = Assignment(dom2, [("x", "b1"), ("y", "g2")])
  
      if not quiet:
          print()
          print("*" * mult)
          print("Models Demo")
          print("*" * mult)
          print("Model m2:\n", "-" * 14, "\n", m2)
          print("Variable assignment = ", g2)
  
          exprs = ["adam", "boy", "love", "walks", "x", "y", "z"]
          parsed_exprs = [Expression.fromstring(e) for e in exprs]
  
          print()
          for parsed in parsed_exprs:
              try:
                  print(
                      "The interpretation of '%s' in m2 is %s"
                      % (parsed, m2.i(parsed, g2))
                  )
              except Undefined:
                  print(
                      "The interpretation of '%s' in m2 is Undefined"
                      % parsed
                  )
  
          applications = [
              ("boy", ("adam")),
              ("walks", ("adam",)),
              ("love", ("adam", "y")),
              ("love", ("y", "adam")),
          ]
  
          for fun, args in applications:
              try:
                  funval = m2.i(Expression.fromstring(fun), g2)
                  argsval = tuple(
                      m2.i(Expression.fromstring(arg), g2)
                      for arg in args
                  )
                  print(
                      f"{fun}({args}) evaluates to {argsval in funval}"
                  )
              except Undefined:
                  print(f"{fun}({args}) evaluates to Undefined")
  
imports: import inspect
  import re
  import sys
  import textwrap
  from pprint import pformat
  from nltk.decorators import decorator
  from nltk.sem.logic import AbstractVariableExpression, AllExpression, AndExpression, ApplicationExpression, EqualityExpression, ExistsExpression, Expression, IffExpression, ImpExpression, IndividualVariableExpression, IotaExpression, LambdaExpression, NegatedExpression, OrExpression, Variable, is_indvar
label_desc: Use image node_id 8 for calling a global function with example usage: folmodel(quiet, trace) without return types