dddd ddot dfdt dfrf dftg dftr dod- dodd dodg dodo doff dog- dogg dogo dogu dood doof door doot dord dorf doro dorr dort doru dotd doto dott doud douf doug dour dout drod drof drog drot drou drug drut druu dtor dtot dudd dudo dudu duff dufu dugu duo- durg duro durt duru duur duut fdot ffff ffrr fftf fofo fogg fogo food foof foot for- ford forg foro forr fort foto fott foud foug four fout frog frot frou frug ftgd fudd fuff fufu fugo fugu fuor fur- furg furo furr furt futo futu gdfr gdor gdrt gfor ggfg gggg godo goff gofr gofu gogo good goof goog goor goot gord gorf gorg goro gorr gort gotd goto gott gou- goud gouf goug gour gout grod grof grog groo gror grot grou grrr gruf grug grur grut gtfo gudo gudu guff gugg gugu gurd gurg guro gurr gurt guru guto gutt gutu oddd odoo odor odot odou odtu odur ofdr off- offo offr offu ofgo ofor ogfr ogod ogog ogou ogro ooff oooo oord oort ordo ordu orff orfu orgo oro- orof oror orot orro orto oto- otof otog otoo otor otro otto ottu otur ouff our- ouro ourt out- outo ouu- rgtr rodd rodo roff rofo rogg rogo rood roof roog roor root roro rort roru rotg roto rotr rott roud rouf rout rrrr rtdt rudd rudo ruff rufo ruft rugg rurd ruro ruru ruto rutt rutu ruud tdff tdor tfot todd todo todt todu toff tofo toft tofu togo togr togt tood toof toor toot tord torf torg toro torr tort toru totd toto totr tott toug tour tout trfd trfr trod trog troo trot trou trtr trud trug trut truu ttff tttt tudu tuff tufo tuft tufu tugg tugu tuor turd turf turg turo turr turt turu tuto tutt tutu tuuo udoo udot uggo uggt ugod ugro ugur uguu uofg uofo uor- urdu urff urft urgu uro- uroo urur urut utfo utor utto uttu utug uutf uuuu