bbbb bbbs bibb bibi bibo bibs biis biko bio- bioi bios biot birb biri birk biro birr birs birt bis- bisk biso biss bist bito bits bitt bobb bobi bobo bobs boi- boii bois boit boki boko boks boob book boor boos boot bor- bori bork boro borr bors bort bosi bosk boso boss bost botb boti boto bots bott brik brio bris brit brkb brob brok broo bror bros brot brrr brrs brsb brsr brst bskt bsos bsts btob btor btrt btss bttb ibis ibos ibot ibri ibro ibss ibtb ibts iiii iiio iiis iiit iioi iioo iios iirs iisi iisr iist iitr iitt ikki ikko ikoo ikri iobi ioii ioio ioit ioko iooi iooo ioos iori iors ioso ioto iri- irio iris irki irks irob irri irrs irti irts isbt isis isit isko iso- isok isor isos isri issi isso issr isss isti isto istr ists itbs itis itko itoi itoo itor itos itri itrs itsi itso itto k-os kbbb kbbi kbbk kbbo kbbr kbbs kbbt kbib kbik kbio kbis kbit kbkb kbkk kbko kbkr kbob kboi kbok kboo kbos kbot kbrb kbri kbrk kbro kbrt kbsb kbsi kbsk kbso kbsr kbss kbst kbtb kbtk kbto kbtr kbts kbtt kibb kibi kibo kibr kibs kibt kiii kiik kiis kiit kiki kikk kiko kikr kikt kioi kiok kioo kiot kirb kiri kirk kiro kirr kirs kirt kisi kisk kiso kisr kiss kist kiti kito kitr kits kitt kkbb kkbi kkbo kkbr kkbs kkbt kkik kkit kkkk kkob kkoo kkor kkot kkrb kkrk kkro kkrr kkrs kkrt kksi kksr kkss kkst kktk kkts kobb kobi kobk kobo kobr kobs koii koir koit kokb koki kokk koko kokr koks koob kooi kook kooo koor koos koot korb kori kork koro korr kors kort kos- kosb kosi koso kosr koss kost kotb koti kotk koto kotr kots kott krbb krbi krbk krbr krbt krib krik krio kris krit krki krkk krko krkr krks krob kroi krok kroo kror kros krrb krri krrk krro krrr krrs krrt krsk krsr krss krst krti krtk krto krtr krts ksbi ksbr ksbs ksib ksii ksik ksir ksis ksit kskb kskk ksko kskr ksks ksob ksoi ksok ksoo ksor ksos ksrb ksro ksrr ksrs ksrt kssi ksso kssr ksss ksst kstb ksti kstk ksto kstr ksts kstt ktbb ktbr ktbt ktib ktik ktis ktkb ktkk ktko ktkr ktks ktkt ktob ktok ktoo ktor ktot ktrb ktri ktrk ktro ktrr ktrs ktrt ktso ktsr ktst ktti kttk ktto kttr ktts kttt obbo obis obit obkb oboi obok obor obos obot obri obro obsr obss obst obts oiii oiko oiks oios oirt oist oiti okir okko okok okor okot okro oksi okso okto oobi oooo ooos oort oosi oost ootb oots orbb orbi orbo orbs ori- orio oris orit orko oro- orok oror oros orot orri orro orrs orsi orsk orso orto orts osii osik osis oski osoi osoo osor osos osro ossb ossi osso osti ostr osts otbs otis otit oto- otok otoo otor otos otro otrs otso otti otto otts rbbb rbbr rbbs rbis rbss rbst rib- ribo ribs riis riki rikk rios riot riri rirs risi risk riso riss rist riti rito rits ritt rkos rkss rkts rob- robb robi robo robs robt roik roio roir rois roit roki rokk roko rokr roks roob rooi rook roor roos root rori rork roro rort rosi roso ross rost roti rotk roto rotr rots rott rrrr rsbi rsis rsos rsts rtss rtts s-ib s-ii s-os sbbs sbor sbot sbrk sbsi sbst sbtk sibi sibo sibs siik siit siki siko sikr siks sior sios siot siri sirk siro sirr sirs sirt sisi sisk siss sist sit- siti sito sits sitt skik skio skir skis skit skor skot skrt skss sobo sobr sobs sobt soik soir sois soit soki sokk soko sook soor soos soot sorb sori soro sorr sors sort sosi soso soss sost sotk soto sots srib sris sros srtr ssbr ssis ssit ssot ssri ssrs sssb sssi ssss sstb ssts stbs stib stik stio stir stis stit stks stob stok stoo stor stos stot stri strk stro strs stsi stss sttr tbbs tbit tbrb tbst tibi tibs tiit tiki tiko tios tirb tiri tiro tirr tirs tisb tisi tiso tiss tist titi tito tits titt tkos tkts tobi tobo tobs tobt tois toit toki toko took toor toos toot tori tork toro torr tors tort tosb tosi tosk toso toss tost toti toto totr tots tott tri- trib trik trio tris trit troi troo tros trot trsi trst trtr tsis tsks tsob tsoi tsos tssi tssr tsst tsts ttbb ttss tttt