-er bbb bbe bbi bbm bbo bbr be- beb bee bei bem beo ber bez bi- bib bie bii bim bio bir biz bmb bme bmi bmm bmo bmr bmz bob boe boi bom boo bor boz brb bre bri brm bro brr brz bze bzo bzr bzz ebb ebe ebi ebm ebo ebr eeb eee eem eeo eer eib eie eii eim eio eir em- emb eme emi emm emo emr eo- eob eoe eoi eom eoo eor erb ere eri erm ero err erz eze ezo ezr ezz ibb ibe ibi ibm ibo ibr ibz ie- iee iei iem ier iib iie iii iim iio iir im- imb ime imi imm imo imz io- iob ioe ioi iom ioo ior ir- irb ire iri irm iro irr ize izi izm izo izz m-o m-r mbb mbe mbi mbm mbo mbr meb mee mei mem meo mer mez mi- mib mie mii mim mio mir miz mmb mme mmi mmm mmo mmr mmz mob moe moi mom moo mor moz mrb mre mri mrm mro mrr mrz mzb mzi mzm o-i ob- obb obe obi obm obo obr oeb oee oei oem oeo oer oib oie oii oim oio oir oiz om- omb ome omi omm omo omr omz oo- oob ooi oom ooo oor or- orb ore ori orm oro orr orz oze ozm ozo ozz rbb rbe rbi rbm rbo rbr re- reb ree rei rem reo rer rez rib rie rii rim rio rir riz rmb rme rmi rmm rmo rmr rob roe roi rom roo ror roz rrb rri rrm rrr rzb rze rzm rzo zbb zbm zbr zeb zee zem zeo zer zez zib zie zim zio zir ziz zmb zmm zo- zob zoe zoi zom zoo zor zro zzr zzz