bbb bbg bbi bbs bby bgb bgg bgi bgs bi- bib big bii bis biy bsb bsg bsi bss bsy by- byg byi bys gbg gbi gbs gby ggb ggg ggi ggs gib gig gii gis giy gsb gsg gsi gss gy- gyb gys ibb ibg ibi ibs iby igb igg igi igs igy iib iii iis is- isb isg isi iss isy iys iyy sbb sbg sbi sbs sby sgb sgg sgi sgs sib sig sii sis ss- ssb ssg ssi sss sy- syb syg syi sys ybg ybi ybs yby yig yii yis ysb ysg ysi yss ysy yyb yyg yys yyy