bbb bbi bbk bbs bby bi- bib bii bik bis biy biz bkb bkk bks bsb bsi bsk bss bsy by- byi byk bys byz bzs bzz ibb ibi ibk ibs iby ibz iib iii iis ikb iki ikk iks is- isb isi isk iss isy iys iyy izi izy izz k-z kbb kbi kbk kbs kbz kib kii kik kis kiz kkb kki kkk kks kky ksb ksi ksk kss kys kyz kzy sbb sbi sbk sbs sby sib sii sik sis sk- skb ski skk sks sky ss- ssb ssi ssk sss ssz sy- syb syi syk sys szi ybi ybs yby ybz yii yis yiz yki ykk ysb ysi ysk yss ysy ysz yyb yys yyy yyz yzb yzy zbb zbs zby zib zik zis ziz zks zsi zsz zzs zzy zzz