-ous oooo ooos oops oost ootp oots oous opo- opos oppo opps opsu opto opts opus osoo osos osso ossu osts oto- otoo otos otpp otso otsu otto otts ottu otus oust out- outo outs ouu- poop poos poot pop- popo popp pops popt poso poss post poto pots pott potu poup pous pout ppos pppo pppp ppps ppss ppts pptt psos psou pspp psps psso psst psts pstu ptop pups pupu puss pust put- puto puts putt putu s-os soop soos soot sopo sopp sops sopu soso soss sost soto sotp sots sotu soup sous sout spoo spop spos spot spps spso spsp spss spst spto spts spus sput ssop ssot sspo ssps sspt ssss sstp ssts stoo stop stos stot stou stpp stps stss stup stus stut suos sup- supo supp sups supt sus- suso susp suss sust susu suto sutu suus toos toot top- topo topp tops topt topu toso toss tost tosu toto tots tott toup tous tout tppp tptp tput tsop tsos tsou tspo tsps tspt tsst tsts tsup ttop ttss tttt tuos tupo tups tupu tuss tust tuto tuts tutt tutu tuuo upos uppp uppu upto upup usos uspo uspp usps usss usst ussu usto ustp usts usus utto uttu uuuu