code: def _get_polymorphics(cls):
      return "*", "*"
  
imports: from sqlalchemy import ForeignKey
  from sqlalchemy import Integer
  from sqlalchemy import String
  from sqlalchemy import util
  from sqlalchemy.orm import polymorphic_union
  from sqlalchemy.orm import relationship
  from sqlalchemy.orm import sessionmaker
  from sqlalchemy.sql.selectable import LABEL_STYLE_TABLENAME_PLUS_COL
  from sqlalchemy.testing import AssertsCompiledSQL
  from sqlalchemy.testing import config
  from sqlalchemy.testing import fixtures
  from sqlalchemy.testing.entities import ComparableEntity
  from sqlalchemy.testing.schema import Column
  from sqlalchemy.testing.schema import Table
label_desc: Use image node_id 1 for calling the _PolymorphicPolymorphic obj's underlying member method code with example usage: obj._get_polymorphics(cls) and returns: str,  str