a-a a-b aaa aab aag aan aao aay ab- aba abb abg abn abo aby ag- aga agb agg agn ago agy an- ana anb ang ann ano any aoa aob aog aon aoo ay- aya ayn ayo baa bab bag ban bao bay bba bbb bbg bbn bbo bby bga bgb bgg bgn bgo bna bnb bng bnn bno boa bob bog bon boo boy by- bya byg byn byo gaa gab gag gan gao gay gba gbg gbn gbo gby gga ggb ggg ggn ggo gna gnb gnn gno goa gob gog gon goo goy gy- gya gyb gyn gyo naa nab nag nan nao nay nba nbb nbg nbn nbo nga ngb ngg ngn ngo nna nnb nng nnn nno no- noa nob nog non noo noy nya nyg nyn nyo nyy oaa oab oag oan oao ob- oba obb obg obn obo oby oga ogg ogn ogo ogy on- ona onb ong onn ono ony oo- ooa oob oog oon ooo oya oyo yaa yab yag yan yao yay ybg yby yga ygo yna yng ynn yny yob yog yon yoo yoy yyb yyg yyy