-ol bbb bbi bbl bbm bbo bbr bi- bib bii bil bim bio bir blb bli bll blm blo blr bmb bmi bml bmm bmo bmr bob boi bol bom boo bor brb bri brl brm bro brr ibb ibi ibl ibm ibo ibr iib iii iil iim iio iir il- ilb ili ill ilm ilo ilr im- imb imi iml imm imo io- iob ioi iol iom ioo ior ir- irb iri irl irm iro irr lbb lbi lbl lbm lbo lbr lib lii lil lim lio lir llb lli lll llm llo llr lmb lmi lml lmm lmo lmr lob loi lol lom loo lor lrb lri lrm lro lrr m-o m-r mbb mbi mbl mbm mbo mbr mi- mib mii mil mim mio mir mlb mli mll mlm mlo mlr mmb mmi mml mmm mmo mmr mob moi mol mom moo mor mrb mri mrl mrm mro mrr o-i ob- obb obi obl obm obo obr oib oii oil oim oio oir olb oli oll olm olo om- omb omi oml omm omo omr oo- oob ooi ool oom ooo oor or- orb ori orl orm oro orr rbb rbi rbl rbm rbo rbr rib rii ril rim rio rir rli rll rlm rlo rlr rmb rmi rml rmm rmo rmr rob roi rol rom roo ror rrb rri rrl rrm rrr