class_docstr: Class for encoding the CNF expression.
code: def copy(self):
      new_data = [set(clause) for clause in self.data]
      return EncodedCNF(new_data, dict(self.encoding))
  
imports: from itertools import combinations, product, zip_longest
  from sympy.assumptions.assume import AppliedPredicate, Predicate
  from sympy.core.relational import Eq, Ne, Gt, Lt, Ge, Le
  from sympy.core.singleton import S
  from sympy.logic.boolalg import Or, And, Not, Xnor
  from sympy.logic.boolalg import Equivalent, ITE, Implies, Nand, Nor, Xor
label_desc: Use image node_id 5 for calling the EncodedCNF obj's underlying member method code with example usage: obj.copy() and returns: EncodedCNF