b-u bbb bbd bbi bbs bbt bbu bby bdb bdd bdi bds bdt bdu bdy bi- bib bid bii bis bit biu biy bsb bsd bsi bss bst bsu bsy btb btd bti bts btt btu bty bub bud bui bus but buu buy by- byd byi bys byt byu dbb dbd dbi dbs dbt dbu dby ddb ddd ddi dds ddt ddu ddy di- dib did dii dis dit diu diy dsb dsd dsi dss dst dsu dsy dtb dtd dti dts dtt dtu dty dub dud dui dus dut duy dy- dyb dyd dys dyu dyy i-d ibb ibd ibi ibs ibt ibu iby idb idd idi ids idt idu idy iib iid iii iis iit iiu is- isb isd isi iss ist isu isy itb itd iti its itt itu ity iu- iub iud iui ius iut iys iyt iyy sbb sbd sbi sbs sbt sbu sby sdb sdd sdi sds sdt sdu sdy sib sid sii sis sit siu ss- ssb ssd ssi sss sst ssu stb std sti sts stt stu sty sub sud sui sus sut suu suy sy- syb syd syi sys syt syu tbb tbd tbi tbs tbt tbu tdb tdd tdi tds tdt tdu tdy tib tid tii tis tit tiu tiy tsb tsd tsi tss tst tsu tsy ttb ttd tti tts ttt ttu tty tub tud tui tus tut tuu tuy tyd tys tyt ubb ubi ubs ubt ubu uby udb udd udi uds udt udu uib uid uii uis uit uiu usb usd usi uss ust usu utb utd uti uts utt utu uty uus uut uuu uyi uys uyu ybi ybs yby yds ydt ydy yid yii yis yit ysb ysi yss yst ysu ysy ytd yts ytt ytu yud yui yus yut yuu yuy yyb yys yyt yyu yyy