b-u bbb bbi bbm bbr bbt bbu bi- bib bii bim bir bit biu bmb bmi bmm bmr bmt bmu brb bri brm brr brt bru btb bti btm btr btt btu bub bui bum bur but buu ibb ibi ibm ibr ibt ibu iib iii iim iir iit iiu im- imb imi imm imt imu ir- irb iri irm irr irt iru itb iti itm itt itu iu- iub iui ium iur iut m-r mbb mbi mbm mbr mbt mbu mi- mib mii mim mir mit miu mmb mmi mmm mmr mmt mmu mrb mri mrm mrr mrt mru mtb mti mtm mtr mtt mtu mub mui mum mur mut muu rbb rbi rbm rbr rbt rbu rib rii rim rir rit rmb rmi rmm rmr rmt rrb rri rrm rrr rrt rru rtb rti rtm rtr rtt rtu rub rui rum rur rut ruu tbb tbi tbm tbr tbt tbu tib tii tim tir tit tiu tmb tmi tmm tmr tmt tmu trb tri trm trr trt tru ttb tti ttm ttr ttt ttu tub tui tum tur tut tuu ubb ubi ubr ubt ubu uib uii uim uir uit uiu um- umb umi umm umr umt umu ur- urb uri urm urr urt uru utb uti utm utr utt utu uum uur uut uuu