dddd ddot dfdt dfrf dftr dntt dnut dod- dodd dodo doff dond donn dono donr dont dood doof doon door doot dord dorf dorn doro dorr dort doru dotd doto dott doud douf doun dour dout drno drod drof dron drot drou drut druu dtor dtot dudd dudo dudu duff dufu dunn duno dunt duo- duon durn duro durt duru duur duut fdot ffff ffrr fftf ffun fndd fndn fndr fnuf fofo fond fono font food foof foon foot for- ford forn foro forr fort foto fott foud foun four fout fron frot frou frun fudd fuff fufu fund funf funt fuor fur- furn furo furr furt futo futu nddo ndnt ndor ndrf ndut nfff nfon nfto nnnn nnot nntn nodo nodu non- nonn nono nont nonu noo- noon nooo noor noot nor- nord norf norn noro norr nort not- noto nott noun nour nout nron nrrd ntnd ntnu ntof ntru ntto nttr nudd nudo nuff nunn nuno nunt nuon nurd nurn nurr nurt nuru nutt nutu oddd odon odoo odor odot odou odtu odur ofdr off- offo offr offu ofno ofor ondo onno onod onon onor ont- onto onur onut ooff oont oooo oord oort ordn ordo ordu orff orfu orno oro- orof oron oror orot orro orto oto- otof oton otoo otor otro otto ottu otur ouff oun- ound our- ourn ouro ourt out- outo ouu- rndf rnnt rnod rnot rntd rnut rodd rodo roff rofo rond rono ront rood roof roon roor root roro rort roru rotn roto rotr rott roud rouf roun rout rrrr rrun rtdt rtnd rudd rudo ruff rufo ruft rund runf runn runo runt rurd ruro ruru ruto rutt rutu ruud ruun tdff tdor tfot tndd tndf tnut todd todo todt todu toff tofo toft tofu tonn tono tonu tood toof toon toor toot tord torf torn toro torr tort toru totd toto totr tott toun tour tout trfd trfr trno trod tron troo trot trou trtr trud trun trut truu ttff ttfn tton tttt tudu tuff tufo tuft tufu tund tunn tuno tunu tuor turd turf turn turo turr turt turu tuto tutt tutu tuuo udon udoo udot udun undo unfd unno unon unrf unro unto unut uofo uor- urdu urff urft uro- uroo urun urur urut utfo utor utto uttu uuno uutf uuuu