-ey a-a a-b a-c aaa aab aac aae aag aay ab- aba abb abc abe abg aby ac- aca acb acc ace acg acy aea aeb aec aee aeg aey ag- aga agb agc age agg agy ay- aya ayc aye baa bab bac bae bag bay bba bbb bbc bbe bbg bby bca bcb bcc bce bcg bcy be- bea beb bec bee beg bey bga bgb bgc bge bgg by- bya byc bye byg c-- caa cab cac cae cag cay cba cbb cbc cbe cbg cby cca ccb ccc cce ccg ce- cea ceb cec cee ceg cey cga cgb cgc cge cgg cgy cya cyb cyc cye cyg eaa eab eac eae eag eba ebb ebc ebe ebg eby ec- eca ecb ecc ece ecg eea eeb eec eee eeg eey ega egb egc ege egg egy eya eyc eye gaa gab gac gae gag gay gba gbc gbe gbg gby gca gcb gcc gce gcg ge- gea geb gec gee geg gey gga ggb ggc ggg gy- gya gyb gye yaa yab yac yae yag yay ybc ybe ybg yby yca ycc yce ycy yea yeb yec yee yeg yey yga ygc yyb yyc yye yyg yyy