-ous bbbb bbbs bobb bobo bobs bobu boob boop boos boot bopp bops boso boss bost bosu botb boto bots bott boup bous bout bpot bpsu bsos bspp bsts bsup btbp btob btps btss bttb btus bubb bubo bubs bubu bups buss bust busu but- buto buts butt buus obbo obos obot obss obst obts obus oooo ooos oops oost ootb ootp oots oous opo- opos oppo opps opsu opto opts opus osbp osoo osos ossb osso ossu osts otbs oto- otoo otos otpp otso otsu otto otts ottu otus oubs oust out- outb outo outs ouu- pbsp pobo pobs poop poos poot pop- popo popp pops popt posb poso poss post poto pots pott potu poup pous pout ppos pppo pppp ppps ppss ppts pptt psbt psos psou pspp psps psso psst psts pstu ptop pubs pubu pups pupu puss pust put- puto puts putt putu s-os sbbs sbot sbsp sbst sbus sobo sobp sobs sobt sobu 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 sptb spto spts spus sput ssop ssot sspo ssps sspt sssb ssss sstb sstp ssts stbs stob stoo stop stos stot stou stpp stps stss stub stup stus stut sub- subb subo subs suos sup- supo supp sups supt sus- suso susp suss sust susu suto sutu suus tbbs tbsp tbst tbtp tobo tobs tobt tobu toos toot top- topo topp tops topt topu tosb toso toss tost tosu toto tots tott toup tous tout tppp tptp tput tsob tsop tsos tsou tspo tsps tspt tsst tsts tsup ttbb ttop ttss tttt tubb tubo tubs tubu tuos tupo tups tupu tuss tust tuto tuts tutt tutu tuuo ubbo ubos upos uppp uppu upto upup usbs usos uspo uspp usps ussb usss usst ussu ustb usto ustp usts usus utto uttu uuuu