dddd ddot dfdt dfrf dfri dftr didi dido didu dif- diff diii dior diot diou dird dirr dirt diti dito ditt dod- dodd dodi dodo doff doid doit dood doof door doot dord dorf dori doro dorr dort doru dotd doti doto dott doud douf dour dout drif drit drod drof drot drou drui drut druu dtor dtot dudd dudo dudu duff dufu duid duif duir duit duo- duri duro durt duru duur duut fdot fdti ffff ffii ffrr fftf fidf fido fiff fifi fifo fift fiii fior fiti fitt fofo foid food foof foot for- ford fori foro forr fort foti foto fott foud four fout frid frio frit frot frou ftdi ftii fudd fudi fuff fufu fuid fuir fuit fuor fur- furi furo furr furt futi futo futu iddo idid idio idir idrf idro iduo ifid ifit ifor ifrf ifri ifto iiii iiio iiit iioi iioo iitr iitt iod- iodd iodo ioii ioio ioit ioof iooi iooo iori iotf ioto irdo irfu iri- irid irio irod irri irtf irti itdo itif itof itoi itoo itor itou itrf itri ittf itto itur iuiu oddd oddi odio odir odiu odoo odor odot odou odtu odur ofdr off- offo offr offu ofid ofit ofor oido oiii oirt oiti oodi ooff ooid oooo oord oort ordo ordu orff orfi orfu ori- orid orif orio orit oro- orof oror orot orri orro orto otif otit oto- otof otoo otor otro otti otto ottu otur ouff ouii ouir ouit our- ouro ourt out- outi outo ouu- rdio rfdi rfid ridd ridi rido riff rift rifu riif riot riou riri riti rito ritt ritu rodd rodi rodo roff rofo roid roif roio roir roit roiu rood roof rooi roor root rori roro rort roru roti roto rotr rott roud rouf rout rrif rrrr rtdt rudd rudi rudo ruff rufo ruft ruid ruif ruit rurd ruri ruro ruru ruti ruto rutt rutu ruud tdff tdor tdri tfot tidd tiff tifo tift tiit tiiu tiou tird tiri tiro tirr tiru titi tito titt titu todd todi todo todt todu toff tofi tofo toft tofu toid toit tood toof toor toot tord torf tori toro torr tort toru totd toti toto totr tott toui tour tout trfd trfr tri- trif trio trit trod troi troo trot trou trtr trud trut truu ttff tttt tudi tudu tuff tufi tufo tuft tufu tuit tuiu tuor turd turf turi turo turr turt turu tuti tuto tutt tutu tuuo uddi udid udir udoo udot uirr uofo uor- urdu urff urfi urft urif uriu uro- uroo urri urur urut utfo utid utor utri utti utto uttu uuri uutf uuuu