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  $page = A:B:C->new();

  $page = A:B:C:D1->new();
  $page = A:B:C:D2->new();

  $page = A:B:C->new();
  $page->check_if_i_should_be_a_subclass_instead();
  $page->render(); # render method from A:B:C or A:B:C:D1  based on ab
+ove method result