b-u bbb bbi bbm bbr bbs bbt bbu bby bi- bib bii bim bir bis bit biu biy bmb bmi bmm bmr bms bmt bmu brb bri brm brr brs brt bru bry bsb bsi bsm bsr bss bst bsu bsy btb bti btm btr bts btt btu bty bub bui bum bur bus but buu buy by- byi bym byr bys byt byu ibb ibi ibm ibr ibs ibt ibu iby iib iii iim iir iis iit iiu im- imb imi imm ims imt imu imy ir- irb iri irm irr irs irt iru iry is- isb isi ism isr iss ist isu isy itb iti itm its itt itu ity iu- iub iui ium iur ius iut iym iyr iys iyt iyy m-r mbb mbi mbm mbr mbs mbt mbu mi- mib mii mim mir mis mit miu miy mmb mmi mmm mmr mms mmt mmu mrb mri mrm mrr mrs mrt mru mry msb msi msm msr mss mst msu msy mtb mti mtm mtr mts mtt mtu mub mui mum mur mus mut muu muy my- myb mym myr mys myt myu rbb rbi rbm rbr rbs rbt rbu rib rii rim rir ris rit riy rmb rmi rmm rmr rms rmt rrb rri rrm rrr rrs rrt rru rsb rsi rsm rsr rss rst rsu rtb rti rtm rtr rts rtt rtu rty rub rui rum rur rus rut ruu ruy ry- rym ryr rys ryu ryy sbb sbi sbm sbr sbs sbt sbu sby sib sii sim sir sis sit siu smb smi smm smr sms smt smu smy sr- srb sri srm srr srs srt sry ss- ssb ssi ssm ssr sss sst ssu stb sti stm str sts stt stu sty sub sui sum sur sus sut suu suy sy- syb syi sym syr sys syt syu tbb tbi tbm tbr tbs tbt tbu tib tii tim tir tis tit tiu tiy tmb tmi tmm tmr tms tmt tmu tmy trb tri trm trr trs trt tru try tsb tsi tsm tsr tss tst tsu tsy ttb tti ttm ttr tts ttt ttu tty tub tui tum tur tus tut tuu tuy tym tyr tys tyt ubb ubi ubr ubs ubt ubu uby uib uii uim uir uis uit uiu um- umb umi umm umr ums umt umu ur- urb uri urm urr urs urt uru ury usb usi usm usr uss ust usu utb uti utm utr uts utt utu uty uum uur uus uut uuu uyi uys uyu ybi ybm ybr ybs yby yii yim yir yis yit ymi ymm yms ymt yrs yrt yru ysb ysi ysm ysr yss yst ysu ysy ytm ytr yts ytt ytu yui yum yur yus yut yuu yuy yyb yys yyt yyu yyy