bbbb bbbs bobb bobo bobs boko boks boob book boor boos boot bor- bork boro borr bors bort bosk boso boss bost botb boto bots bott brkb brob brok broo bror bros brot brrr brrs brsb brsr brst bskt bsos bsts btob btor btrt btss bttb k-os kbbb kbbk kbbo kbbr kbbs kbbt kbkb kbkk kbko kbkr kbob kbok kboo kbos kbot kbrb kbrk kbro kbrt kbsb kbsk kbso kbsr kbss kbst kbtb kbtk kbto kbtr kbts kbtt kkbb kkbo kkbr kkbs kkbt kkkk kkob kkoo kkor kkot kkrb kkrk kkro kkrr kkrs kkrt kksr kkss kkst kktk kkts kobb kobk kobo kobr kobs kokb kokk koko kokr koks koob kook kooo koor koos koot korb kork koro korr kors kort kos- kosb koso kosr koss kost kotb kotk koto kotr kots kott krbb krbk krbr krbt krkk krko krkr krks krob krok kroo kror kros krrb krrk krro krrr krrs krrt krsk krsr krss krst krtk krto krtr krts ksbr ksbs kskb kskk ksko kskr ksks ksob ksok ksoo ksor ksos ksrb ksro ksrr ksrs ksrt ksso kssr ksss ksst kstb kstk ksto kstr ksts kstt ktbb ktbr ktbt ktkb ktkk ktko ktkr ktks ktkt ktob ktok ktoo ktor ktot ktrb ktrk ktro ktrr ktrs ktrt ktso ktsr ktst kttk ktto kttr ktts kttt obbo obkb obok obor obos obot obro obsr obss obst obts okko okok okor okot okro okso okto oooo ooos oort oost ootb oots orbb orbo orbs orko oro- orok oror oros orot orro orrs orsk orso orto orts osoo osor osos osro ossb osso ostr osts otbs oto- otok otoo otor otos otro otrs otso otto otts rbbb rbbr rbbs rbss rbst rkos rkss rkts rob- robb robo robs robt rokk roko rokr roks roob rook roor roos root rork roro rort roso ross rost rotk roto rotr rots rott rrrr rsos rsts rtss rtts s-os sbbs sbor sbot sbrk sbst sbtk skor skot skrt skss sobo sobr sobs sobt sokk soko sook soor soos soot sorb soro sorr sors sort soso soss sost sotk soto sots sros srtr ssbr ssot ssrs sssb ssss sstb ssts stbs stks stob stok stoo stor stos stot strk stro strs stss sttr tbbs tbrb tbst tkos tkts tobo tobs tobt toko took toor toos toot tork toro torr tors tort tosb tosk toso toss tost toto totr tots tott troo tros trot trst trtr tsks tsob tsos tssr tsst tsts ttbb ttss tttt