b-u bbb bbi bbm bbn bbr bbu bi- bib bii bim bin bir biu bmb bmi bmm bmn bmr bmu bnb bni bnn bnr bnu brb bri brm brn brr bru bub bui bum bun bur buu ibb ibi ibm ibn ibr ibu iib iii iim iin iir iiu im- imb imi imm imn imu in- inb ini inm inn inr inu ir- irb iri irm irn irr iru iu- iub iui ium iur m-r mbb mbi mbm mbr mbu mi- mib mii mim min mir miu mmb mmi mmm mmn mmr mmu mnb mni mnm mnn mnr mnu mrb mri mrm mrn mrr mru mub mui mum mun mur muu n-i nbb nbi nbm nbn nbr nbu nib nii nim nin nir niu nmb nmi nmm nmn nmr nmu nnb nni nnm nnn nnu nrb nri nrm nrn nrr nru nub nui num nun nur nuu rbb rbi rbm rbn rbr rbu rib rii rim rin rir rmb rmi rmm rmn rmr rnb rni rnm rnn rnr rnu rrb rri rrm rrn rrr rru rub rui rum run rur ruu ubb ubi ubn ubr ubu uib uii uim uin uir uiu um- umb umi umm umn umr umu un- unb uni unm unn unr unu ur- urb uri urm urn urr uru uum uun uur uuu