bbbb bbbs bffs bfts bftt bobb bobo bobs boff bofs boko boks boob boof book boos boot bosk boso boss bost botb boto bots bott bsff bsfs bskt bsos bsts btob btss bttb f--k ffff ffss fftf fobs fobt fofo foof fook foos foot fosb foso foss fost foto fots fott fsfo fssf ftos k-os kbbb kbbf kbbk kbbo kbbs kbbt kbfb kbff kbfk kbfo kbfs kbft kbkb kbkf kbkk kbko kbob kbok kboo kbos kbot kbsb kbsk kbso kbss kbst kbtb kbtf kbtk kbto kbts kbtt kfbk kfbt kffb kfff kffk kfkb kfok kfoo kfsk kfst kftk kftt kkbb kkbo kkbs kkbt kkfs kkft kkkk kkob kkoo kkot kksf kkss kkst kktk kkts kobb kobk kobo kobs koff kofk kofo koft kokb kokf kokk koko koks koob kook kooo koos koot kos- kosb kosf koso koss kost kotb kotk koto kots kott ksbs ksfb ksfo ksft kskb kskf kskk ksko ksks ksob ksof ksok ksoo ksos ksso ksss ksst kstb kstk ksto ksts kstt ktbb ktbt ktfb ktfo ktfs ktkb ktkk ktko ktks ktkt ktob ktok ktoo ktot ktsf ktso ktst kttf kttk ktto ktts kttt obbo obkb obok obos obot obss obst obts off- offo offs ofst okko okok okot okso okto ooff oofs oooo ooos oost ootb oots osoo osos ossb osso osts otbs oto- otof otok otoo otos otso otto otts s-os sbbs sbot sbst sbtk sfos sfss sfts skot skss sobo sobs sobt sofo soft sokk soko soof sook soos soot soso soss sost sotk soto sots ssot sssb sssf ssss sstb ssts stbs stks stob stof stok stoo stos stot stsf stss tbbs tbst tfot tfss tkof tkos tkts tobo tobs tobt toff tofo toft toko toof took toos toot tosb tosk toso toss tost toto tots tott tsks tsob tsos tssf tsst tsts ttbb ttff ttss tttt