bbb bbg bbi bbm bbs bgb bgg bgi bgm bgs bi- bib big bii bim bis bmb bmg bmi bmm bms bsb bsg bsi bsm bss gbg gbi gbm gbs ggb ggg ggi ggm ggs gib gig gii gim gis gmb gmg gmi gmm gms gsb gsg gsi gsm gss ibb ibg ibi ibm ibs igb igg igi igm igs iib iii iim iis im- imb img imi imm ims is- isb isg isi ism iss mbb mbg mbi mbm mbs mgb mgi mgm mgs mi- mib mig mii mim mis mmb mmg mmi mmm mms msb msg msi msm mss sbb sbg sbi sbm sbs sgb sgg sgi sgm sgs sib sig sii sim sis smb smg smi smm sms ss- ssb ssg ssi ssm sss