a-a a-b aaa aab aag aan aao aar aay ab- aba abb abg abn abo abr aby ag- aga agb agg agn ago agr agy an- ana anb ang ann ano anr any aoa aob aog aon aoo aor ar- ara arb arg arn aro arr ary ay- aya ayn ayo ayr baa bab bag ban bao bar bay bba bbb bbg bbn bbo bbr bby bga bgb bgg bgn bgo bgr bna bnb bng bnn bno bnr boa bob bog bon boo bor boy bra brb brg brn bro brr bry by- bya byg byn byo byr gaa gab gag gan gao gar gay gba gbg gbn gbo gbr gby gga ggb ggg ggn ggo ggr gna gnb gnn gno gnr goa gob gog gon goo gor goy gra grb grg grn gro grr gry gy- gya gyb gyn gyo gyr naa nab nag nan nao nar nay nba nbb nbg nbn nbo nbr nga ngb ngg ngn ngo nna nnb nng nnn nno no- noa nob nog non noo nor noy nra nrb nrg nrn nro nrr nry nya nyg nyn nyo nyy oaa oab oag oan oao oar ob- oba obb obg obn obo obr oby oga ogg ogn ogo ogy on- ona onb ong onn ono onr ony oo- ooa oob oog oon ooo oor or- ora orb org orn oro orr ory oya oyo ra- raa rab rag ran rao rar ray rba rbb rbg rbn rbo rbr rga rgb rgg rgn rgo rgr rna rnb rng rnn rno rnr rny roa rob rog ron roo ror roy rra rrb rrg rrn rrr ry- rya ryg ryn ryo ryr ryy yaa yab yag yan yao yar yay ybg ybr yby yga ygo yna yng ynn yny yob yog yon yoo yor yoy yra yrg yrn yro yyb yyg yyy