a-a a-b a-i aaa aab aag aai aar aay ab- aba abb abg abi abr aby ag- aga agb agg agi agr agy ai- aia aib aig aii air aiy ar- ara arb arg ari arr ary ay- aya ayi ayr baa bab bag bai bar bay bba bbb bbg bbi bbr bby bga bgb bgg bgi bgr bi- bia bib big bii bir biy bra brb brg bri brr bry by- bya byg byi byr gaa gab gag gai gar gay gba gbg gbi gbr gby gga ggb ggg ggi ggr gia gib gig gii gir giy gra grb grg gri grr gry gy- gya gyb gyr ia- iaa iab iag iai iar iba ibb ibg ibi ibr iby iga igb igg igi igr igy iia iib iii iir ir- ira irb irg iri irr iry iya iyr iyy ra- raa rab rag rai rar ray rba rbb rbg rbi rbr rga rgb rgg rgi rgr ria rib rig rii rir riy rra rrb rrg rri rrr ry- rya ryg ryr ryy yaa yab yag yai yar yay ybg ybi ybr yby yga yig yii yir yra yrg yyb yyg yyy