bbb bbg bbi bbm bbr bgb bgg bgi bgm bgr bi- bib big bii bim bir bmb bmg bmi bmm bmr brb brg bri brm brr gbg gbi gbm gbr ggb ggg ggi ggm ggr gib gig gii gim gir gmb gmg gmi gmm gmr grb grg gri grm grr ibb ibg ibi ibm ibr igb igg igi igm igr iib iii iim iir im- imb img imi imm ir- irb irg iri irm irr m-r mbb mbg mbi mbm mbr mgb mgi mgm mgr mi- mib mig mii mim mir mmb mmg mmi mmm mmr mrb mrg mri mrm mrr rbb rbg rbi rbm rbr rgb rgg rgi rgr rib rig rii rim rir rmb rmg rmi rmm rmr rrb rrg rri rrm rrr