-ous dddd ddot ddss ddts dfds dfdt dfrf dftr dfts dod- dodd dodo dods doff dood doof door doos doot dord dorf doro dorr dors dort doru doso doss dost dotd doto dots dott doud douf dour dous dout drod drof drot drou drrs drus drut druu dsdr dsos dsrr dsst dsto dsts dtor dtot dtss dudd dudo duds dudu duff dufu duo- duos duro durt duru dust duts duur duut fdos fdot fdst ffff ffrr ffss fftf fofo food foof foos foot for- ford foro forr fors fort foso foss fost foto fots fott foud four fous fout fros frot frou frso frst fsfo fssf ftos ftrs ftsr fudd fuff fufu fuor fur- furo furr furs furt fusd fuso fuss fust fusu futo futs futu oddd odds odoo odor odos odot odou odso odts odtu odur odus ofdr off- offo offr offs offu ofor ofst ofus ooff oofs oooo ooos oord oort oost oots oous ordo ords ordu orff orfs orfu oro- orof oror oros orot orro orrs orso orsu orto orts orus osoo osor osos osrd osro ossd osso ossu ostr osts oto- otof otoo otor otos otro otrs otso otsu otto otts ottu otur otus ouds ouff our- ouro ours ourt ousd oust out- outo outs ouu- rdos rdso rfds rodd rodo rods roff rofo rood roof roor roos root roro rort roru roso ross rost roto rotr rots rott roud rouf rous rout rrrr rsdd rsds rsos rsts rstu rtdt rtss rtts rudd rudo ruds ruff rufo ruft rurd ruro rurs ruru ruso russ rust rusu ruto ruts rutt rutu ruud s-os sdds sdot sdrs sdsf sdss sdsu sfor sfos sfro sfss sfsu sfts sodd sodo sods sodu sofo soft sood soof soor soos soot sord soro sorr sors sort soru soso soss sost soto sots sotu soud souf sour sous sout sros srsd srtr ssdd ssdf ssot ssrs sssf ssss sstd ssts stds stfu stod stof stoo stor stos stot stou strd stro strs stru stsf stss sttd sttr stud stuf stur stus stut sudd sudo suds suf- suff sufr sufs sufu suor suos sur- surd surf suro surr surs surt suru sus- susd suso suss sust susu suto sutu suus tdff tdor tdss tfot tfrs tfsd tfss todd todo tods todt todu toff tofo toft tofu tood toof toor toos toot tord torf toro torr tors tort toru toso toss tost tosu totd toto totr tots tott tour tous tout trfd trfr trod troo tros trot trou trsd trst trtr trud trus trut truu tsos tsou tssf tssr tsst tsts ttff ttss tttt tudu tuff tufo tuft tufu tuor tuos turd turf turo turr turs turt turu tusd tuss tust tuto tuts tutt tutu tuuo udds udoo udos udot udsd udts ufos uofo uor- urds urdu urff urft uro- uroo urso urss ursu urts urur urus urut usdf usdo usds usdt usfs usos ussf ussr usss usst ussu usto usts usus utfo utor utto uttu uutf uuuu