b-u bbb bbd bbi bbr bbt bbu bby bdb bdd bdi bdr bdt bdu bdy bi- bib bid bii bir bit biu biy brb brd bri brr brt bru bry btb btd bti btr btt btu bty bub bud bui bur but buu buy by- byd byi byr byt byu dbb dbd dbi dbr dbt dbu dby ddb ddd ddi ddr ddt ddu ddy di- dib did dii dir dit diu diy drb drd dri drr drt dru dry dtb dtd dti dtr dtt dtu dty dub dud dui dur dut duy dy- dyb dyd dyr dyu dyy i-d ibb ibd ibi ibr ibt ibu iby idb idd idi idr idt idu idy iib iid iii iir iit iiu ir- irb ird iri irr irt iru iry itb itd iti itt itu ity iu- iub iud iui iur iut iyr iyt iyy rbb rbd rbi rbr rbt rbu rdb rdd rdi rdr rdt rdu rdy rib rid rii rir rit riy rrb rrd rri rrr rrt rru rtb rtd rti rtr rtt rtu rty rub rud rui rur rut ruu ruy ry- ryd ryr ryu ryy tbb tbd tbi tbr tbt tbu tdb tdd tdi tdr tdt tdu tdy tib tid tii tir tit tiu tiy trb trd tri trr trt tru try ttb ttd tti ttr ttt ttu tty tub tud tui tur tut tuu tuy tyd tyr tyt ubb ubi ubr ubt ubu uby udb udd udi udr udt udu uib uid uii uir uit uiu ur- urb urd uri urr urt uru ury utb utd uti utr utt utu uty uur uut uuu uyi uyu ybi ybr yby ydt ydy yid yii yir yit yrt yru ytd ytr ytt ytu yud yui yur yut yuu yuy yyb yyt yyu yyy