-ey bbb bbe bbk bbs bby be- beb bee bek bes bey bez bkb bke bkk bks bsb bse bsk bss bsy by- bye byk bys byz bze bzs bzz ebb ebe ebk ebs eby eeb eee eek ees eey ekb eke eks eky es- esb ese esk ess esy eye eys eze ezs ezz k-z kbb kbe kbk kbs kbz ke- keb kee kek kes key kez kkb kke kkk kks kky ksb kse ksk kss kye kys kyz kzy sbb sbe sbk sbs sby se- seb see sek ses sey sez sk- skb ske skk sks sky ss- ssb sse ssk sss ssz sy- syb sye syk sys sze ybe ybs yby ybz yeb yee yek yes yey yez ykk ysb yse ysk yss ysy ysz yyb yye yys yyy yyz yzb yzy zbb zbs zby zeb zee zek zes zez zks zse zsz zzs zzy zzz