a-a a-b a-i aaa aab aag aai aas aay ab- aba abb abg abi abs aby ag- aga agb agg agi ags agy ai- aia aib aig aii ais aiy as- asa asb asg asi ass asy ay- aya ayi ays baa bab bag bai bas bay bba bbb bbg bbi bbs bby bga bgb bgg bgi bgs bi- bia bib big bii bis biy bsa bsb bsg bsi bss bsy by- bya byg byi bys gaa gab gag gai gas gay gba gbg gbi gbs gby gga ggb ggg ggi ggs gia gib gig gii gis giy gsa gsb gsg gsi gss gy- gya gyb gys ia- iaa iab iag iai ias iba ibb ibg ibi ibs iby iga igb igg igi igs igy iia iib iii iis is- isa isb isg isi iss isy iya iys iyy saa sab sag sai sas say sba sbb sbg sbi sbs sby sga sgb sgg sgi sgs sia sib sig sii sis ss- ssa ssb ssg ssi sss sy- sya syb syg syi sys yaa yab yag yai yas yay ybg ybi ybs yby yga yig yii yis ysa ysb ysg ysi yss ysy yyb yyg yys yyy