b-u bbb bbi bbr bbt bbu bby bi- bib bii bir bit biu biy brb bri brr brt bru bry btb bti btr btt btu bty bub bui bur but buu buy by- byi byr byt byu ibb ibi ibr ibt ibu iby iib iii iir iit iiu ir- irb iri irr irt iru iry itb iti itt itu ity iu- iub iui iur iut iyr iyt iyy rbb rbi rbr rbt rbu rib rii rir rit riy rrb rri rrr rrt rru rtb rti rtr rtt rtu rty rub rui rur rut ruu ruy ry- ryr ryu ryy tbb tbi tbr tbt tbu tib tii tir tit tiu tiy trb tri trr trt tru try ttb tti ttr ttt ttu tty tub tui tur tut tuu tuy tyr tyt ubb ubi ubr ubt ubu uby uib uii uir uit uiu ur- urb uri urr urt uru ury utb uti utr utt utu uty uur uut uuu uyi uyu ybi ybr yby yii yir yit yrt yru ytr ytt ytu yui yur yut yuu yuy yyb yyt yyu yyy