bbb bbg bbi bbr bbs bby bgb bgg bgi bgr bgs bi- bib big bii bir bis biy brb brg bri brr brs bry bsb bsg bsi bsr bss bsy by- byg byi byr bys gbg gbi gbr gbs gby ggb ggg ggi ggr ggs gib gig gii gir gis giy grb grg gri grr grs gry gsb gsg gsi gsr gss gy- gyb gyr gys ibb ibg ibi ibr ibs iby igb igg igi igr igs igy iib iii iir iis ir- irb irg iri irr irs iry is- isb isg isi isr iss isy iyr iys iyy rbb rbg rbi rbr rbs rgb rgg rgi rgr rgs rib rig rii rir ris riy rrb rrg rri rrr rrs rsb rsg rsi rsr rss ry- ryg ryr rys ryy sbb sbg sbi sbr sbs sby sgb sgg sgi sgr sgs sib sig sii sir sis sr- srb srg sri srr srs sry ss- ssb ssg ssi ssr sss sy- syb syg syi syr sys ybg ybi ybr ybs yby yig yii yir yis yrg yrs ysb ysg ysi ysr yss ysy yyb yyg yys yyy