-ey b-u bbb bbc bbe bbk bbs bbu bby bcb bcc bce bck bcs bcu bcy be- beb bec bee bek bes beu bey bkb bkc bke bkk bks bsb bsc bse bsk bss bsu bsy bub buc bue buk bus buu buy by- byc bye byk bys byu c-- cbb cbc cbe cbk cbs cbu cby ccb ccc cce cck ccs ccu ce- ceb cec cee cek ces ceu cey ckb ckc cks cky csb csc cse csk css csu csy cub cuc cue cuk cus cuu cuy cyb cyc cye cyk cys ebb ebc ebe ebk ebs ebu eby ec- ecb ecc ece eck ecs ecu eeb eec eee eek ees eey ekb ekc eke eks eku eky es- esb esc ese esk ess esu esy eu- eub euc eue eus eyc eye eys kbb kbc kbe kbk kbs kbu kcb kcc kce kck kcs kcu ke- keb kec kee kek kes key kkb kkc kke kkk kks kku kky ksb ksc kse ksk kss ksu kub kuc kue kuk kus kuu kuy kyc kye kys kyu sbb sbc sbe sbk sbs sbu sby scb scc sce sck scs scu se- seb sec see sek ses seu sey sk- skb skc ske skk sks sku sky ss- ssb ssc sse ssk sss ssu sub suc sue suk sus suu suy sy- syb syc sye syk sys syu ubb ubc ube ubk ubs ubu uby ucb ucc uce uck ucs ucu ueb uec uee ues uey ukb ukc uke ukk uku usb usc use usk uss usu uuc uue uus uuu uyc uys uyu ybc ybe ybs yby ycc yce ycs ycu ycy yeb yec yee yek yes yey ykk ysb ysc yse ysk yss ysu ysy yue yuk yus yuu yuy yyb yyc yye yys yyu yyy