bbbb bbbs bobb bobo bobs boob boop boos boot bopp bops boso boss bost botb boto bots bott bpot bsos bspp bsts btbp btob btps btss bttb obbo obos obot obss obst obts oooo ooos oops oost ootb ootp oots opo- opos oppo opps opto opts osbp osoo osos ossb osso osts otbs oto- otoo otos otpp otso otto otts pbsp pobo pobs poop poos poot pop- popo popp pops popt posb poso poss post poto pots pott ppos pppo pppp ppps ppss ppts pptt psbt psos pspp psps psso psst psts ptop s-os sbbs sbot sbsp sbst sobo sobp sobs sobt soop soos soot sopo sopp sops soso soss sost soto sotp sots spoo spop spos spot spps spso spsp spss spst sptb spto spts ssop ssot sspo ssps sspt sssb ssss sstb sstp ssts stbs stob stoo stop stos stot stpp stps stss tbbs tbsp tbst tbtp tobo tobs tobt toos toot top- topo topp tops topt tosb toso toss tost toto tots tott tppp tptp tsob tsop tsos tspo tsps tspt tsst tsts ttbb ttop ttss tttt