-ey a-a a-b aaa aab aae aak aas aay ab- aba abb abe abk abs aby aea aeb aee aek aes aey aka akb ake akk aks as- asa asb ase ask ass asy ay- aya aye ayk ays baa bab bae bak bas bay bba bbb bbe bbk bbs bby be- bea beb bee bek bes bey bka bkb bke bkk bks bsa bsb bse bsk bss bsy by- bya bye byk bys eaa eab eae eak eas eba ebb ebe ebk ebs eby eea eeb eee eek ees eey eka ekb eke eks eky es- esa esb ese esk ess esy eya eye eys ka- kaa kab kae kak kas kay kba kbb kbe kbk kbs ke- kea keb kee kek kes key kkb kke kkk kks kky ksa ksb kse ksk kss kya kye kys saa sab sae sak sas say sba sbb sbe sbk sbs sby se- sea seb see sek ses sey sk- ska skb ske skk sks sky ss- ssa ssb sse ssk sss sy- sya syb sye syk sys yaa yab yae yak yas yay ybe ybs yby yea yeb yee yek yes yey yka ykk ysa ysb yse ysk yss ysy yyb yye yys yyy