b-u bbb bbi bbm bbr bbu bi- bib bii bim bir biu biz bmb bmi bmm bmr bmu bmz brb bri brm brr bru brz bub bui bum bur buu buz bzr bzu bzz ibb ibi ibm ibr ibu ibz iib iii iim iir iiu im- imb imi imm imu imz ir- irb iri irm irr iru iu- iub iui ium iur iuz izi izm izu izz m-r mbb mbi mbm mbr mbu mi- mib mii mim mir miu miz mmb mmi mmm mmr mmu mmz mrb mri mrm mrr mru mrz mub mui mum mur muu mzb mzi mzm rbb rbi rbm rbr rbu rib rii rim rir riz rmb rmi rmm rmr rrb rri rrm rrr rru rub rui rum rur ruu ruz rzb rzm ubb ubi ubr ubu uib uii uim uir uiu um- umb umi umm umr umu ur- urb uri urm urr uru urz uum uur uuu uzb uzi uzu zbb zbm zbr zib zim zir ziz zmb zmm zub zui zum zur zuz zzr zzz