code: def create_missing_type_variants(cls, type_names, type_dict):
          
          missing_type_names = [ name for name in type_names
                                 if name not in type_dict ]
          return cls.create_type_variants(missing_type_names, type_dict)
docs: Create missing type variants for types with a cardinality field.
  
          :param type_names: List of type names with cardinality field suffix.
          :param type_dict:  Type dictionary with named type converters.
          :return: Type dictionary with missing type converter variants.