DUOTONED

de do ed en et ne no nu od oe on to un ut

den doe don dot dud due dun duo end eon net nod noo not nut odd ode one ono oot oud out ted ten tod toe ton too tun udo ute

dent dodo done dote dude duet dune dunt eddo node note nude onto tend toed tone toon tune udon unde undo unto