-ey a-a a-b aaa aab aae aag aao aay ab- aba abb abe abg abo aby aea aeb aee aeg aeo aey ag- aga agb age agg ago agy aoa aob aoe aog aoo ay- aya aye ayo baa bab bae bag bao bay bba bbb bbe bbg bbo bby be- bea beb bee beg beo bey bga bgb bge bgg bgo boa bob boe bog boo boy by- bya bye byg byo eaa eab eae eag eao eba ebb ebe ebg ebo eby eea eeb eee eeg eeo eey ega egb ege egg ego egy eo- eoa eob eoe eog eoo eya eye eyo gaa gab gae gag gao gay gba gbe gbg gbo gby ge- gea geb gee geg geo gey gga ggb ggg ggo goa gob goe gog goo goy gy- gya gyb gye gyo oaa oab oae oag oao ob- oba obb obe obg obo oby oea oeb oee oeg oeo oey oga oge ogg ogo ogy oo- ooa oob oog ooo oya oye oyo yaa yab yae yag yao yay ybe ybg yby yea yeb yee yeg yeo yey yga ygo yob yoe yog yoo yoy yyb yye yyg yyy