bbb bbi bbm bbo bbr bi- bib bii bim bio bir biz bmb bmi bmm bmo bmr bmz bob boi bom boo bor boz brb bri brm bro brr brz bzo bzr bzz ibb ibi ibm ibo ibr ibz iib iii iim iio iir im- imb imi imm imo imz io- iob ioi iom ioo ior ir- irb iri irm iro irr izi izm izo izz m-o m-r mbb mbi mbm mbo mbr mi- mib mii mim mio mir miz mmb mmi mmm mmo mmr mmz mob moi mom moo mor moz mrb mri mrm mro mrr mrz mzb mzi mzm o-i ob- obb obi obm obo obr oib oii oim oio oir oiz om- omb omi omm omo omr omz oo- oob ooi oom ooo oor or- orb ori orm oro orr orz ozm ozo ozz rbb rbi rbm rbo rbr rib rii rim rio rir riz rmb rmi rmm rmo rmr rob roi rom roo ror roz rrb rri rrm rrr rzb rzm rzo zbb zbm zbr zib zim zio zir ziz zmb zmm zo- zob zoi zom zoo zor zro zzr zzz