dddd ddot dod- dodd dodo dood door doot dord doro dorr dort doru dotd doto dott doud dour dout drod drot drou drut druu dtor dtot dudd dudo dudu duo- duro durt duru duur duut oddd odoo odor odot odou odtu odur oooo oord oort ordo ordu oro- oror orot orro orto oto- otoo otor otro otto ottu otur our- ouro ourt out- outo ouu- rodd rodo rood roor root roro rort roru roto rotr rott roud rout rrrr rtdt rudd rudo rurd ruro ruru ruto rutt rutu ruud tdor todd todo todt todu tood toor toot tord toro torr tort toru totd toto totr tott tour tout trod troo trot trou trtr trud trut truu tttt tudu tuor turd turo turr turt turu tuto tutt tutu tuuo udoo udot uor- urdu uro- uroo urur urut utor utto uttu uuuu