b-u bbb bbi bbk bbm bbr bbu bi- bib bii bik bim bir biu bkb bkk bkm bkr bmb bmi bmk bmm bmr bmu brb bri brk brm brr bru bub bui buk bum bur buu ibb ibi ibk ibm ibr ibu iib iii iim iir iiu ikb iki ikk ikr iku im- imb imi imm imu ir- irb iri irk irm irr iru iu- iub iui ium iur kbb kbi kbk kbm kbr kbu kib kii kik kim kir kiu kkb kki kkk kkm kkr kku kmb kmi kmk kmm kmu kri krk krr kru kub kui kuk kum kur kuu m-r mbb mbi mbk mbm mbr mbu mi- mib mii mik mim mir miu mkb mkk mkm mkr mku mmb mmi mmk mmm mmr mmu mrb mri mrk mrm mrr mru mub mui muk mum mur muu rbb rbi rbk rbm rbr rbu rib rii rik rim rir rkb rkk rkm rku rmb rmi rmm rmr rrb rri rrk rrm rrr rru rub rui ruk rum rur ruu ubb ubi ubk ubr ubu uib uii uim uir uiu ukb uki ukk ukr uku um- umb umi umm umr umu ur- urb uri urk urm urr uru uum uur uuu