dddd ddot dfdt dfrf dftr dod- dodd dodo doff dood doof door doot dord dorf doro dorr dort doru dotd doto dott doud douf dour dout drod drof drot drou drut druu dtor dtot dudd dudo dudu duff dufu duo- duro durt duru duur duut fdot ffff ffrr fftf fofo food foof foot for- ford foro forr fort foto fott foud four fout frot frou fudd fuff fufu fuor fur- furo furr furt futo futu oddd odoo odor odot odou odtu odur ofdr off- offo offr offu ofor ooff oooo oord oort ordo ordu orff orfu oro- orof oror orot orro orto oto- otof otoo otor otro otto ottu otur ouff our- ouro ourt out- outo ouu- rodd rodo roff rofo rood roof roor root roro rort roru roto rotr rott roud rouf rout rrrr rtdt rudd rudo ruff rufo ruft rurd ruro ruru ruto rutt rutu ruud tdff tdor tfot todd todo todt todu toff tofo toft tofu tood toof toor toot tord torf toro torr tort toru totd toto totr tott tour tout trfd trfr trod troo trot trou trtr trud trut truu ttff tttt tudu tuff tufo tuft tufu tuor turd turf turo turr turt turu tuto tutt tutu tuuo udoo udot uofo uor- urdu urff urft uro- uroo urur urut utfo utor utto uttu uutf uuuu