class_docstr: Lexicographic order of monomials. 
code: def __call__(self, monomial):
      return monomial
  
imports: from __future__ import annotations
  from sympy.core import Symbol
  from sympy.utilities.iterables import iterable
label_desc: Use image node_id 1 for calling the LexOrder obj's underlying member method code with example usage: obj.__call__(monomial) and returns: monomial