b-u bbb bbk bbo bbr bbs bbt bbu bkb bkk bko bkr bks bkt bkv bob bok boo bor bos bot bou bov brb brk bro brr brs brt bru brv bsb bsk bso bsr bss bst bsu bsv btb btk bto btr bts btt btu btv bub buk buo bur bus but buu bvb bvk bvo bvr bvs bvt bvu bvv k-t kbb kbk kbo kbr kbs kbu kkb kkk kkr kks kkt kku kkv kob kok koo kor kos kot kou krk kro krr krs krt kru krv ksb ksk kso ksr kss kst ksu ksv ktb ktk kto ktr kts ktt ktu ktv kub kuk kur kus kut kuu kvb kvk kvo kvr kvs kvv ob- obb obk obo obr obs obt obu obv okb okk oko okr oks oku oo- oob ook ooo oor oos oot oov or- orb ork oro orr ors ort oru orv os- osb osk oso osr oss ost osu osv ot- otb otk oto otr ots ott otu otv ou- ouk ouo our ous out ov- ovb ovo ovs ovv rbb rbk rbo rbr rbs rbt rbu rkb rkk rko rks rkt rku rkv rob rok roo ror ros rot rou rov rrb rrk rrr rrs rrt rru rsb rsk rso rsr rss rst rsu rsv rtb rtk rto rtr rts rtt rtu rtv rub ruk ruo rur rus rut ruu ruv rvb rvo rvr rvs rvt rvu rvv sbb sbk sbo sbr sbs sbt sbu sbv sk- skb skk sko skr sks skt sku sob sok soo sor sos sot sou sov sr- srb srk sro srr srs srt srv ss- ssb ssk sso ssr sss sst ssu ssv stb stk sto str sts stt stu stv sub suk suo sur sus sut suu suv svb svk svo svr svs svt svu svv tbb tbk tbo tbr tbs tbt tbu tbv tkb tkk tko tkr tks tkt to- tob tok too tor tos tot tou tov trb trk tro trr trs trt tru trv tsb tsk tso tsr tss tst tsu tsv ttb ttk tto ttr tts ttt ttu ttv tub tuk tuo tur tus tut tuu tuv tvb tvk tvo tvr tvs tvt tvu ubb ubk ubo ubr ubs ubt ubu ubv ukb ukk ukr uku uob uok uoo uor uos uot ur- urb urk uro urr urs urt uru usb usk uso usr uss ust usu usv utb utk uto utr uts utt utu utv uur uus uut uuu uvb uvo uvs uvu uvv vbk vbo vbr vbs vbv vkb vkt vob vok voo vor vos vot vou vov vrb vrk vrr vrs vrt vru vsb vsk vso vsr vss vst vsu vsv vtb vtk vto vtr vts vtt vtu vtv vuk vur vus vut vuv vvb vvo vvr vvs vvt vvv

-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