-ous bbbb bbbs bobb bobo bobs bobu boko boks boku boob book boor boos boot bor- bork boro borr bors bort boru bosk boso boss bost bosu botb boto bots bott bouk bour bous bout bovo brkb brob brok broo bror bros brot brou brrr brrs brsb brsr brst brus brut bruv bskt bsos bsts bstv btob btor btrt btss bttb btus bubb bubo bubs bubu bukk buko buku bur- burb burk buro burr burs burt buru busk buss bust busu but- buto buts butt buus k-os kbbb kbbk kbbo kbbr kbbs kbbt kbbu kbkb kbkk kbko kbkr kbkv kbob kbok kboo kbos kbot kbov kbrb kbrk kbro kbrt kbru kbrv kbsb kbsk kbso kbsr kbss kbst kbsu kbsv kbtb kbtk kbto kbtr kbts kbtt kbtv kbub kbuk kbur kbus kbut kbuu kbvb kbvo kbvr kbvu kkbb kkbo kkbr kkbs kkbt kkkk kkob kkoo kkor kkot kkov kkrb kkrk kkro kkrr kkrs kkrt kkrv kksr kkss kkst kksu kktk kkts kktu kktv kkus kkut kkuu kkvr kkvt kkvu kkvv kobb kobk kobo kobr kobs kobu kokb kokk koko kokr koks koku koob kook kooo koor koos koot koou koov korb kork koro korr kors kort koru korv kos- kosb koso kosr koss kost kosu kotb kotk koto kotr kots kott kotu kotv koub kour kous kout kouu kovk kovo kovr krbb krbk krbr krbt krkk krko krkr krks krku krkv krob krok kroo kror kros krov krrb krrk krro krrr krrs krrt krsk krsr krss krst krsu krsv krtk krto krtr krts krtv kruk krur krvb krvk krvo krvr krvs krvv ksbr ksbs ksbv kskb kskk ksko kskr ksks ksku ksob ksok ksoo ksor ksos ksou ksrb ksro ksrr ksrs ksrt ksrv ksso kssr ksss ksst kssu kstb kstk ksto kstr ksts kstt kstu kstv ksub ksut ksuu ksvr ksvu ktbb ktbr ktbt ktbu ktkb ktkk ktko ktkr ktks ktkt ktku ktob ktok ktoo ktor ktot ktrb ktrk ktro ktrr ktrs ktrt ktru ktrv ktso ktsr ktst ktsu kttk ktto kttr ktts kttt kttu kttv ktub ktuv ktvb ktvk ktvo ktvr ktvt ktvu kubb kubo kubr kubs kubu kukk kuks kuku kuok kuoo kuos kurb kurk kuro kurr kurs kurt kuru kurv kusb kuso kust kusu kuto kutr kuts kutt kutu kutv kuub kuuk kuur kuuu kuvo kuvr kvbr kvbt kvob kvok kvoo kvor kvot kvou kvov kvro kvrr kvrv kvso kvsr kvss kvst kvsv kvtk kvto kvtr kvtt kvtv kvuu kvvr kvvs kvvv obbo obkb obok obor obos obot obro obsr obss obst obts obus obvs okko okok okor okot okro okso okto okur okus ooku oooo ooos oort oost ootb oots oous orbb orbo orbs orbu orko oro- orok oror oros orot orro orrs orsk orso orsu orto orts orub orus orvr orvs osku osoo osor osos osov osro ossb osso ossu ostr osts otbs oto- otok otoo otor otos otov otro otrs otso otsu otto otts ottu otur otus oubs our- ouro ours ourt oust out- outb outo outs ouu- ovo- ovoo ovot rbbb rbbr rbbs rbss rbst rkos rkss rksv rkts rob- robb robo robs robt robu rokk roko rokr roks roku roob rook roor roos root rork roro rort roru roso ross rost rotk roto rotr rots rott roub rouk rous rout rovo rovs rrrr rsos rsts rstu rtss rtts rubb rubs rubu rukk ruku ruok ruro rurs ruru rusk ruso russ rust rusu ruto ruts rutt rutu ruvu s-os s-vt sbbs sbor sbot sbrk sbst sbtk sbus skor skot skov skrt skss skur skut sobo sobr sobs sobt sobu sokk soko soku sook soor soos soot sorb soro sorr sors sort soru soso soss sost sosv sotk soto sots sotu souk sour sous sout sovo sovs sovu sros srtr srtv srub ssbr ssot ssrs sssb ssss sstb ssts st-v stbs stks stob stok stoo stor stos stot stou strk stro strs stru stss sttr stub stuk stur stus stut stuv stvs sub- subb subo subs suks suku suor suos sur- suro surr surs surt suru surv sus- susk suso suss sust susu suto sutu suus suvs svor svtr tbbs tbrb tbst tkos tkts tobo tobs tobt tobu toko toku took toor toos toot tork toro torr tors tort toru torv tosb tosk toso toss tost tosu toto totr tots tott touk tour tous tout touv tovo troo tros trot trou trst trtr trub truk trus trut truu trvs tsks tsob tsos tsou tssr tsst tsts ttbb ttss tttt tubb tubo tubr tubs tubu tuko tuks tuor tuos turb turk turo turr turs turt turu tusk tuss tust tuto tuts tutt tutu tuuo tvbs tvos tvro tvrr tvss tvtv ubbo ubos ukko ukok uktv ukur uor- uovo urbs uro- urok uroo urso urss ursu urts uruk urur urus urut us-k usbr usbs usos usov ussb ussr usss usst ussu ustb usto usts usus utor utto uttu uuuu uv-b uvok uvvu vkor voks voor voot vor- voro vors vort voru voso voss vosu voto vouk vour vous vout vovk vrot vrto vruk vsto vtrs vuku vurb vurt vutv vvob vvsb vvvv