oooo ooos oops oost ootp oots ootw opo- opos oppo opps opto opts osoo osos osow osso osts oto- otoo otos otow otpp otpw otso otto otts otwo owow owt- owtt poop poos poot pop- popo popp pops popt poso poss post poto pots pott potw powp pows powt ppos pppo pppp ppps ppss ppts pptt psos pspp psps psso psst psts ptop pwts s-os soop soos soot sopo sopp sops soso soss sost soto sotp sots sotw sowp sows sowt spoo spop spos spot spps spso spsp spss spst spto spts ssop ssot sspo ssps sspt ssss sstp ssts ssws stoo stop stos stot stow stpp stps stss swoo swop swot swow swss swts toos toot top- topo topp tops topt toso toss tost toto tots tott tows tppp tptp tpws tsop tsos tspo tsps tspt tsst tsts ttop ttss tttt two- twoo twop twos twot twps twss woop woos woot woow wopp wops woso wosp woss wost wosw wots wott wotw wowo wowp wows wowt woww wpop wpot wpow wppt wpso wpsp wpst wptw wpwt wsoo wsop wsos wspo wsps wspt wssp wsss wsst wssw wsto wstp wsts wstt wstw wsws wswt wsww wtot wtow wtps wtpt wtso wtsp wtss wtto wtts wttt wttw wtwo wtws wtwt wtww wwos wwot wwow wwpt wwpw wwsp wwss wwst wwtp wwtw wwws wwww