-ous ffff ffss fftf fofo foof foos foot foso foss fost foto fots fott foty fous fout foys foyt fsfo fssf ftfy ftos fuff fufu fuso fuss fust fusu futo futs futu fuyt fuyu off- offo offs offu offy ofst ofus ooff oofs oofy oooo ooos oost oots ooty oous osoo osos osso ossu ossy osts osyt oto- otof otoo otos otoy otso otsu otto otts ottu otus ouff oust out- outo outs outy ouu- oyou oyss oyst s-os sfos sfss sfsu sfts sofo soft soof soos soot sooy soso soss sost soto sots sotu souf sous sout soyo soys soyt ssot sssf ssss ssts stfu stof stoo stos stot stou stoy stsf stss stuf stus stut stuy styf stys suf- suff sufs sufu suos sus- suso suss sust susu susy suto sutu suty suus suyo suyu syff syfy syso syss syst sytt tfot tfss to-y toff tofo toft tofu toof toos toot toso toss tost tosu tosy toto tots tott toty tous tout toyo toys toyt tsos tsou tsoy tssf tsst tsts tsys ttff ttoy ttss tttt ttys tuff tufo tuft tufu tuos tuss tust tuto tuts tutt tutu tuty tuuo tuys tyff tyft tyss tyst tyto tytt tyty tyus ufos uofo usfs usos ussf usss usst ussu ussy usto usts usus utfo utoy utto uttu uutf uuuu uyts yoff yoof yoot yoso yost yott youf yous yout yoyo yssu yuff yuft yufu yust yuto yutu yuty yuyu yyff yyyy