b-u bbb bbc bbk bbo bbs bbt bbu bcb bcc bck bco bcs bct bcu bkb bkc bkk bko bks bkt bob boc bok boo bos bot bou bsb bsc bsk bso bss bst bsu btb btc btk bto bts btt btu bub buc buk buo bus but buu c-- cbb cbc cbk cbo cbs cbt cbu ccb ccc cck cco ccs cct ccu ckb ckc cko cks ckt co- cob coc cok coo cos cot cou csb csc csk cso css cst csu ctb ctc ctk cto cts ctt ctu cub cuc cuk cuo cus cut cuu k-t kbb kbc kbk kbo kbs kbu kcb kcc kck kcs kct kcu kkb kkc kkk kks kkt kku kob koc kok koo kos kot kou ksb ksc ksk kso kss kst ksu ktb ktc ktk kto kts ktt ktu kub kuc kuk kus kut kuu ob- obb obc obk obo obs obt obu oc- ocb occ ock oco ocs oct ocu okb okc okk oko oks oku oo- oob ooc ook ooo oos oot os- osb osc osk oso oss ost osu ot- otb otc otk oto ots ott otu ou- ouc ouk ouo ous out sbb sbc sbk sbo sbs sbt sbu scb scc sck sco scs sct scu sk- skb skc skk sko sks skt sku sob soc sok soo sos sot sou ss- ssb ssc ssk sso sss sst ssu stb stc stk sto sts stt stu sub suc suk suo sus sut suu tbb tbc tbk tbo tbs tbt tbu tcb tcc tck tco tcs tct tcu tkb tkc tkk tko tks tkt to- tob toc tok too tos tot tou tsb tsc tsk tso tss tst tsu ttb ttc ttk tto tts ttt ttu tub tuc tuk tuo tus tut tuu ubb ubc ubk ubo ubs ubt ubu ucb ucc uck uco ucs uct ucu ukb ukc ukk uku uob uoc uok uoo uos uot usb usc usk uso uss ust usu utb utc utk uto uts utt utu uuc uus uut uuu

-ous bbbb bbbs bcbc bcbs bccc bccs bcos bcsc bcss bctc bcts bcuc bobb bobo bobs bobu bock boco bocs bocu boko boks boku boob booc book boos boot bosc bosk boso boss bost bosu botb boto bots bott bouk bous bout bscs bskt bsos bssc bsts btcc btcs btob btss bttb btus bubb bubo bubs bubu bucc buck buco bucs bucu bukk buko buku busc busk buss bust busu but- buto buts butt buus c-bo cbbc cbbs cbcc cbcs cbct cbcu cbko cbot cbsc cbtc cbus ccbc cccb cccc cccs cccu ccob ccoc ccss ccst cctb cctc cctt ccuc ccus ccut ckbc ckck ckco ckcs ckob ckoc ckoo ckos ckot cksb ckso ckst cktb ckts cobb cobo cobs cobu cock coco coct cocu cok- coko coob cook coos coot cosc coso coss cost cotb cotc coto cots cott cotu coub couk cous cout cscb cscc csco cscs csks csob csos csot cstc csto csts csus ctbs ctos ctot ctsc ctss ctsu ctts cub- cubb cubs cucc cuck cuk- cusb cusk cuso cuss cust cusu cut- cutc cuto cuts cutt k-os kbbb kbbc kbbk kbbo kbbs kbbt kbbu kbcb kbck kbco kbcs kbct kbcu kbkb kbkk kbko kbob kboc kbok kboo kbos kbot kbsb kbsk kbso kbss kbst kbsu kbtb kbtc kbtk kbto kbts kbtt kbub kbuc kbuk kbus kbut kbuu kcbc kcbk kcbs kcbu kccb kccc kcck kcct kccu kckc kckk kcko kcob kcos kcot kcou kcsb kcsc kcss kcst kcsu kctb kctc kcto kctu kcub kcuk kkbb kkbo kkbs kkbt kkcb kkck kkco kkcs kkct kkkk kkob kkoo kkot kkss kkst kksu kktc kktk kkts kktu kkus kkut kkuu kobb kobc kobk kobo kobs kobu kocb kock kocs koct kokb kokc kokk koko koks koku koob kooc kook kooo koos koot koou kos- kosb kosc koso koss kost kosu kotb kotc kotk koto kots kott kotu koub kous kout kouu ksbc ksbs kscb ksck ksco kscs kscu kskb kskk ksko ksks ksku ksob ksoc ksok ksoo ksos ksou ksso ksss ksst kssu kstb kstc kstk ksto ksts kstt kstu ksub ksut ksuu ktbb ktbc ktbt ktbu ktcc ktck ktco ktcs ktkb ktkc ktkk ktko ktks ktkt ktku ktob ktoc ktok ktoo ktot ktsc ktso ktst ktsu kttc kttk ktto ktts kttt kttu ktub ktuc kubb kubc kubo kubs kubu kucb kucc kuco kukk kuks kuku kuok kuoo kuos kusb kusc kuso kust kusu kuto kuts kutt kutu kuub kuuk kuuu obbo obkb obok obos obot obss obst obts obus ocbc occc occt ocks ocos oct- octo octs okcu okko okok okot okso okto okus ooku oooo ooos oost ootb oots oous oscc osco osku osoo osos ossb osso ossu ostc osts otbs oto- otok otoo otos otso otsu otto otts ottu otus oubs oucc oust out- outb outo outs ouu- s-os sbbs sbcc sbcs sbct sbot sbst sbtc sbtk sbus sccc sccs scct sck- scob scok scoo scot scsc scso scst scsu sctc scto scts scub scut skot skss skut sobo sobs sobt sobu sock soco socs sokk soko soku sook soos soot soso soss sost sotc sotk soto sots sotu souk sous sout sscc sscs ssoc ssot sssb sssc ssss sstb sstc ssts stbc stbs stcc stcs stcu stks stob stok stoo stos stot stou stss sttc stub stuc stuk stus stut sub- subb subo subs suc- succ suck sucs suks suku suos sus- susk suso suss sust susu suto sutu suus tbbs tbcb tbcc tbst tcbs tccc tccu tcos tctc tcts tkos tkts tobo tobs tobt tobu tock toco toko toku took toos toot tosb tosc tosk toso toss tost tosu totc toto tots tott touk tous tout tsbc tscc tsks tsob tsos tsou tsst tstc tsts ttbb ttss tttt tubb tubo tubs tubu tucc tuck tuco tuko tuks tuos tusc tusk tuss tust tuto tuts tutt tutu tuuo ubbo uboc ubos ucbc ucos ucsb ucsc ucst ucsu ucut ukcc ukko ukok uksc uocc us-k usbc usbs uscc usco uscs usoc usos ussb ussc usss usst ussu ustb ustc