b-u bbb bbc bbk bbo bbr bbs bbt bbu bcb bcc bck bco bcr bcs bct bcu bkb bkc bkk bko bkr bks bkt bob boc bok boo bor bos bot bou brb brk bro brr brs brt bru bsb bsc bsk bso bsr bss bst bsu btb btc btk bto btr bts btt btu bub buc buk buo bur bus but buu c-- cbb cbc cbk cbo cbr cbs cbt cbu ccb ccc cck cco ccr ccs cct ccu ckb ckc cko cks ckt co- cob coc cok coo cor cos cot cou crb crc crk cro crr crs crt cru csb csc csk cso csr css cst csu ctb ctc ctk cto ctr cts ctt ctu cub cuc cuk cuo cur cus cut cuu k-t kbb kbc kbk kbo kbr kbs kbu kcb kcc kck kcr kcs kct kcu kkb kkc kkk kkr kks kkt kku kob koc kok koo kor kos kot kou krc krk kro krr krs krt kru ksb ksc ksk kso ksr kss kst ksu ktb ktc ktk kto ktr kts ktt ktu kub kuc kuk kur kus kut kuu ob- obb obc obk obo obr obs obt obu oc- ocb occ ock oco ocr ocs oct ocu okb okc okk oko okr oks oku oo- oob ooc ook ooo oor oos oot or- orb orc ork oro orr ors ort oru os- osb osc osk oso osr oss ost osu ot- otb otc otk oto otr ots ott otu ou- ouc ouk ouo our ous out rbb rbc rbk rbo rbr rbs rbt rbu rcb rcc rco rcr rcs rct rcu rkb rkc rkk rko rks rkt rku rob roc rok roo ror ros rot rou rrb rrc rrk rrr rrs rrt rru rsb rsc rsk rso rsr rss rst rsu rtb rtc rtk rto rtr rts rtt rtu rub ruc ruk ruo rur rus rut ruu sbb sbc sbk sbo sbr sbs sbt sbu scb scc sck sco scr scs sct scu sk- skb skc skk sko skr sks skt sku sob soc sok soo sor sos sot sou sr- srb src srk sro srr srs srt ss- ssb ssc ssk sso ssr sss sst ssu stb stc stk sto str sts stt stu sub suc suk suo sur sus sut suu tbb tbc tbk tbo tbr tbs tbt tbu tcb tcc tck tco tcr tcs tct tcu tkb tkc tkk tko tkr tks tkt to- tob toc tok too tor tos tot tou trb trc trk tro trr trs trt tru tsb tsc tsk tso tsr tss tst tsu ttb ttc ttk tto ttr tts ttt ttu tub tuc tuk tuo tur tus tut tuu ubb ubc ubk ubo ubr ubs ubt ubu ucb ucc uck uco ucr ucs uct ucu ukb ukc ukk ukr uku uob uoc uok uoo uor uos uot ur- urb urc urk uro urr urs urt uru usb usc usk uso usr uss ust usu utb utc utk uto utr uts utt utu uuc uur uus uut uuu

-ous bbbb bbbs bbrc bcbc bcbs bccc bccs bcor bcos bcrs bcru bcsc bcss bctc bcts bcuc bobb bobo bobs bobu bock boco bocs bocu boko boks boku boob booc book boor boos boot bor- bork boro borr bors bort boru bosc bosk boso boss bost bosu botb boto bots bott bouk bour bous bout brcb brkb brob broc brok broo bror bros brot brou brrr brrs brsb brsr brst brtc bruc brus brut bscs bskt bsos bssc bsts btcc btcs btob btor btrc btrt btss bttb btus bubb bubo bubs bubu bucc buck buco bucs bucu bukk buko buku bur- burb burk buro burr burs burt buru busc busk buss bust busu but- buto buts butt buus c-bo cbbc cbbs cbcc cbcr cbcs cbct cbcu cbko cbkr cbot cbrt cbsc cbtc cbus ccbc cccb cccc cccs cccu ccob ccoc ccrc ccrs ccrt ccss ccst cctb cctc cctt ccuc ccus ccut ckbc ckck ckco ckcs ckob ckoc ckoo ckor ckos ckot ckrc cksb ckso ckst cktb ckts cobb cobo cobs cobu cock coco coct cocu cok- coko coob cook coos coot cor- corb corc cork coro corr cors cort cosc coso coss cost cotb cotc coto cots cott cotu coub couk cour cous cout crbc crbu crcc crcr crkc crob croc crok croo cror crot crrt crss crst crtc crts crub cruk crus crut cscb cscc csco cscr cscs csks csob csor csos csot csrc csrs cssr cstc csto cstr csts csur csus ctbs ctor ctos ctot ctrc ctrs ctsc ctss ctsu ctts cub- cubb cubs cucc cuck cuk- curb curo curr curs curt cusb cusk cuso cuss cust cusu cut- cutc cuto cuts cutt k-os kbbb kbbc kbbk kbbo kbbr kbbs kbbt kbbu kbcb kbck kbco kbcr kbcs kbct kbcu kbkb kbkk kbko kbkr kbob kboc kbok kboo kbos kbot kbrb kbrc kbrk kbro kbrt kbru kbsb kbsk kbso kbsr kbss kbst kbsu kbtb kbtc kbtk kbto kbtr kbts kbtt kbub kbuc kbuk kbur kbus kbut kbuu kcbc kcbk kcbr kcbs kcbu kccb kccc kcck kccr kcct kccu kckc kckk kcko kckr kcob kcor kcos kcot kcou kcrc kcro kcrr kcrs kcrt kcru kcsb kcsc kcsr kcss kcst kcsu kctb kctc kcto kctu kcub kcuk kkbb kkbo kkbr kkbs kkbt kkcb kkck kkco kkcr kkcs kkct kkkk kkob kkoo kkor kkot kkrb kkrc kkrk kkro kkrr kkrs kkrt kksr kkss kkst kksu kktc kktk kkts kktu kkus kkut kkuu kobb kobc kobk kobo kobr kobs kobu kocb kock kocs koct kokb kokc kokk koko kokr koks koku koob kooc kook kooo koor koos koot koou korb korc kork koro korr kors kort koru kos- kosb kosc koso kosr koss kost kosu kotb kotc kotk koto kotr kots kott kotu koub kour kous kout kouu krbb krbk krbr krbt krcb krcc krco krcs krcu krkc krkk krko krkr krks krku krob kroc krok kroo kror kros krrb krrc krrk krro krrr krrs krrt krsc krsk krsr krss krst krsu krtc krtk krto krtr krts kruc kruk krur ksbc