-ey a-a a-c aaa aac aae aaf aak aay ac- aca acc ace acf ack acy aea aec aee aef aek aey af- afa afc afe aff afk afy aka akc ake akk ay- aya ayc aye ayf ayk c-- caa cac cae caf cak cay cca ccc cce ccf cck ce- cea cec cee cef cek cey cfa cfc cfe cff cfk cka ckc cky cya cyc cye cyf cyk eaa eac eae eaf eak ec- eca ecc ece ecf eck eea eec eee eef eek eey ef- efa efc efe eff eka ekc eke ekf eky eya eyc eye faa fac fae faf fak fay fca fcc fce fcf fck fcy fea fec fee fef fek fey ffa ffc ffe fff ffk ffy fka fkc fkf fkk fy- fya fyc fye fyk ka- kaa kac kae kaf kak kay kca kcc kce kck ke- kea kec kee kef kek key kfa kfc kff kkc kke kkk kky kya kyc kye yaa yac yae yaf yak yay yca ycc yce ycf ycy yea yec yee yef yek yey yfa yfc yfe yff yka ykk yyc yye yyf yyy