b-u bbb bbi bbm bbr bbu bi- bib bii bim bir biu bmb bmi bmm bmr bmu brb bri brm brr bru bub bui bum bur buu ibb ibi ibm ibr ibu iib iii iim iir iiu im- imb imi imm imu ir- irb iri irm irr iru iu- iub iui ium iur m-r mbb mbi mbm mbr mbu mi- mib mii mim mir miu mmb mmi mmm mmr mmu mrb mri mrm mrr mru mub mui mum mur muu rbb rbi rbm rbr rbu rib rii rim rir rmb rmi rmm rmr rrb rri rrm rrr rru rub rui rum rur ruu ubb ubi ubr ubu uib uii uim uir uiu um- umb umi umm umr umu ur- urb uri urm urr uru uum uur uuu