bbbb bbbs bbws bobb bobo bobs bobw boob boos boot boow boso boss bost botb boto bots bott botw bows bowt bsos bsts btob btss bttb btwo obbo obos obot obss obst obts oooo ooos oost ootb oots ootw osoo osos osow ossb osso osts otbs oto- otoo otos otow otso otto otts otwo owow owt- owtt s-os sbbs sbot sbst sobo sobs sobt soos soot soso soss sost soto sots sotw sows sowt ssot sssb ssss sstb ssts ssws stbs stob stoo stos stot stow stss swbs swbw swob swoo swot swow swss swts tbbs tbst tobo tobs tobt toos toot tosb toso toss tost toto tots tott tows tsob tsos tsst tsts ttbb ttss tttt twbt two- twob twoo twos twot twss wbbb wbbo wbbs wbbt wbbw wbob wbos wbow wbsb wbss wbst wbsw wbto wbts wbtt wbtw wbwb wbwo wbwt wobb wobo wobt woob woos woot woow woso woss wost wosw wotb wots wott wotw wowb wowo wows wowt woww wsbb wsbs wsbt wsbw wsob wsoo wsos wsss wsst wssw wstb wsto wsts wstt wstw wswb wsws wswt wsww wtbb wtbo wtbs wtob wtot wtow wtsb wtso wtss wttb wtto wtts wttt wttw wtwb wtwo wtws wtwt wtww wwbb wwbt wwos wwot wwow wwsb wwss wwst wwtw wwws wwww