-ous ffff ffps ffss fftf fofo foof foos foot fopp fops foso foss fost foto fotp fots fott foup fous fout fsfo fspf fssf fssp ftop ftos ftps fuff fufu fuso fuss fust fusu futo futs futu off- offo offs offu ofst oftp ofus ooff oofs oooo ooos oops oost ootp oots oous opo- opos oppo opps opsu opto opts opus osoo osos osso ossu osts otfp oto- otof otoo otos otpp otso otsu otto otts ottu otus ouff oust out- outo outs ouu- pfff pfft pfps poff poof poop poos poot pop- popo popp pops popt poso poss post potf poto pots pott potu pouf poup pous pout ppos pppo pppp ppps ppsf ppss ppts pptt psfs psos psou pspp psps psso psst psts pstu ptop puff puft pups pupu puss pust put- puto puts putt putu s-os sfos sfss sfsu sftp sfts sofo soft soof soop soos soot sopo sopp sops sopu soso soss sost soto sotp sots sotu souf soup sous sout spfs spoo spop spos spot sppf spps spso spsp spss spst spto spts spus sput ssfp ssop ssot sspf sspo ssps sspt sssf ssss sstp ssts stfu stof stoo stop stos stot stou stpf stpp stps stsf stss stuf stup stus stut suf- suff sufs sufu suos sup- supo supp sups supt sus- suso susp suss sust susu suto sutu suus tfot tfpt tfss tftp toff tofo toft tofu toof toos toot top- topf topo topp tops topt topu toso toss tost tosu toto tots tott toup tous tout tppp tptp tput tsop tsos tsou tspo tsps tspt tssf tsst tsts tsup ttff ttop ttss tttt tuff tufo tuft tufu tuos tupo tups tupu tuss tust tuto tuts tutt tutu tuuo ufos uftp uofo upos uppp uppu upto upup usfs usos uspo uspp usps ussf usss usst ussu usto ustp usts usus utfo utto uttu uutf uuuu