b-u bbb bbi bbl bbm bbr bbu bi- bib bii bil bim bir biu blb bli bll blm blr blu bmb bmi bml bmm bmr bmu brb bri brl brm brr bru bub bui bul bum bur buu ibb ibi ibl ibm ibr ibu iib iii iil iim iir iiu il- ilb ili ill ilm ilr ilu im- imb imi iml imm imu ir- irb iri irl irm irr iru iu- iub iui ium iur lbb lbi lbl lbm lbr lbu lib lii lil lim lir liu llb lli lll llm llr llu lmb lmi lml lmm lmr lmu lrb lri lrm lrr lru lub lui lul lum lur luu m-r mbb mbi mbl mbm mbr mbu mi- mib mii mil mim mir miu mlb mli mll mlm mlr mlu mmb mmi mml mmm mmr mmu mrb mri mrl mrm mrr mru mub mui mul mum mur muu rbb rbi rbl rbm rbr rbu rib rii ril rim rir rli rll rlm rlr rlu rmb rmi rml rmm rmr rrb rri rrl rrm rrr rru rub rui rum rur ruu ubb ubi ubl ubr ubu uib uii uil uim uir uiu ulb uli ull ulm ulr ulu um- umb umi uml umm umr umu ur- urb uri url urm urr uru uum uur uuu