-ey a-a a-b a-c aaa aab aac aae aag aau aay ab- aba abb abc abe abg abu aby ac- aca acb acc ace acg acu acy aea aeb aec aee aeg aeu aey ag- aga agb agc age agg agu agy au- aua aub auc aue aug ay- aya ayc aye ayu b-u baa bab bac bae bag bau bay bba bbb bbc bbe bbg bbu bby bca bcb bcc bce bcg bcu bcy be- bea beb bec bee beg beu bey bga bgb bgc bge bgg bgu bua bub buc bue bug buu buy by- bya byc bye byg byu c-- caa cab cac cae cag cau cay cba cbb cbc cbe cbg cbu cby cca ccb ccc cce ccg ccu ce- cea ceb cec cee ceg ceu cey cga cgb cgc cge cgg cgu cgy cua cub cuc cue cug cuu cuy cya cyb cyc cye cyg eaa eab eac eae eag eau eba ebb ebc ebe ebg ebu eby ec- eca ecb ecc ece ecg ecu eea eeb eec eee eeg eey ega egb egc ege egg egu egy eu- eua eub euc eue eug eya eyc eye gaa gab gac gae gag gau gay gba gbc gbe gbg gbu gby gca gcb gcc gce gcg gcu ge- gea geb gec gee geg geu gey gga ggb ggc ggg ggu gu- gua gub guc gue gug guu guy gy- gya gyb gye ua- uaa uab uac uae uag uau uay uba ubb ubc ube ubg ubu uby uca ucb ucc uce ucg ucu uea ueb uec uee ueg uey uga ugb ugc uge ugg ugu uua uuc uue uug uuu uyc uyu yaa yab yac yae yag yau yay ybc ybe ybg yby yca ycc yce ycu ycy yea yeb yec yee yeg yey yga ygc yua yue yug yuu yuy yyb yyc yye yyg yyu yyy