-ey a-a a-b a-c aaa aab aac aae aah aay ab- aba abb abc abe abh aby ac- aca acb acc ace ach acy aea aeb aec aee aeh aey aha ahb ahc ahe ahh ahy ay- aya ayc aye ayh baa bab bac bae bah bay bba bbb bbc bbe bbh bby bca bcb bcc bce bch bcy be- bea beb bec bee beh bey bha bhb bhc bhe bhh by- bya byc bye byh c-- caa cab cac cae cah cay cba cbb cbc cbe cbh cby cca ccb ccc cce cch ce- cea ceb cec cee ceh cey ch- cha chb chc che chh chy cya cyb cyc cye eaa eab eac eae eah eba ebb ebc ebe ebh eby ec- eca ecb ecc ece ech eea eeb eec eee eey eha ehb ehc ehe ehh eya eyc eye haa hab hac hae hah hay hba hbb hbc hbe hbh hby hca hcb hcc hce hch hcy he- hea heb hec hee heh hey hha hhb hhc hhe hhh hhy hy- hya hyb hyc hye hyh hyy yaa yab yac yae yah yay ybc ybe yby yca ycc yce ych ycy yea yeb yec yee yeh yey yha yhc yhe yyb yyc yye yyy