bbbb bbbs bbwr bbws bobb bobo bobs bobw boob boor boos boot boow bor- boro borr bors bort borw boso boss bost botb boto bots bott botw bowr bows bowt brob broo bror bros brot brow brrr brrs brsb brsr brst bsos bsts btob btor btrt btss bttb btwo obbo obor obos obot obro obsr obss obst obts oooo ooos oort oost ootb oots ootw orbb orbo orbs oro- oror oros orot orro orrs orso orto orts orwo osoo osor osos osow osro ossb osso ostr osts otbs oto- otoo otor otos otow otro otrs otso otto otts otwo owow owt- owtt rbbb rbbr rbbs rbss rbst rob- robb robo robs robt roob roor roos root roro rort roso ross rost roto rotr rots rott rowb rowr rows rowt roww rrrr rsos rsts rtss rtts s-os sbbs sbor sbot sbst sbwr sobo sobr sobs sobt soor soos soot sorb soro sorr sors sort soso soss sost soto sots sotw sowr sows sowt sros srtr ssbr ssot ssrs sssb ssss sstb ssts ssws stbs stob stoo stor stos stot stow stro strs stss sttr swbs swbw swob swoo swor swot swow swss swts tbbs tbrb tbst tobo tobs tobt toor toos toot toro torr tors tort tosb toso toss tost toto totr tots tott tows troo tros trot trow trst trtr tsob tsos tssr tsst tsts ttbb ttss tttt twbt two- twob twoo twos twot twss wbbb wbbo wbbr wbbs wbbt wbbw wbob wbor wbos wbow wbrb wbrr wbrs wbrt wbrw wbsb wbsr wbss wbst wbsw wbto wbtr wbts wbtt wbtw wbwb wbwo wbwt wobb wobo wobt woob woos woot woow worb woro worr wors wort worw woso woss wost wosw wotb wotr wots wott wotw wowb wowo wows wowt woww wrbb wrbo wrbs wrbt wrbw wrob wroo wros wrot wrow wrrb wrro wrrs wrrw wrsb wrso wrsr wrss wrsw wrtb wrto wrtr wrts wrtw wrwb wrwr wsbb wsbr wsbs wsbt wsbw wsob wsoo wsor wsos wsrb wsro wsrs wsrt wsrw wssr wsss wsst wssw wstb wsto wstr wsts wstt wstw wswb wswr wsws wswt wsww wtbb wtbo wtbr wtbs wtob wtor wtot wtow wtrb wtro wtrs wtrt wtrw wtsb wtso wtsr wtss wttb wtto wttr wtts wttt wttw wtwb wtwo wtwr wtws wtwt wtww wwbb wwbr wwbt wwor wwos wwot wwow wwrb wwrr wwrw wwsb wwsr wwss wwst wwtr wwtw wwwr wwws wwww