a-a a-b aaa aab aad aar aas aau aay ab- aba abb abd abr abs abu aby ad- ada adb add adr ads adu ady ar- ara arb ard arr ars aru ary as- asa asb asd asr ass asu asy au- aua aub aud aur aus ay- aya ayd ayr ays ayu b-u baa bab bad bar bas bau bay bba bbb bbd bbr bbs bbu bby bda bdb bdd bdr bds bdu bdy bra brb brd brr brs bru bry bsa bsb bsd bsr bss bsu bsy bua bub bud bur bus buu buy by- bya byd byr bys byu daa dab dad dar das dau day dba dbb dbd dbr dbs dbu dby dda ddb ddd ddr dds ddu ddy dra drb drd drr drs dru dry dsa dsb dsd dsr dss dsu dsy dua dub dud dur dus duy dy- dya dyb dyd dyr dys dyu dyy ra- raa rab rad rar ras rau ray rba rbb rbd rbr rbs rbu rda rdb rdd rdr rds rdu rdy rra rrb rrd rrr rrs rru rsa rsb rsd rsr rss rsu rua rub rud rur rus ruu ruy ry- rya ryd ryr rys ryu ryy saa sab sad sar sas sau say sba sbb sbd sbr sbs sbu sby sda sdb sdd sdr sds sdu sdy sr- sra srb srd srr srs sry ss- ssa ssb ssd ssr sss ssu sua sub sud sur sus suu suy sy- sya syb syd syr sys syu ua- uaa uab uad uar uas uau uay uba ubb ubr ubs ubu uby uda udb udd udr uds udu ur- ura urb urd urr urs uru ury usa usb usd usr uss usu uua uur uus uuu uys uyu yaa yab yad yar yas yau yay ybr ybs yby yda yds ydy yra yrs yru ysa ysb ysr yss ysu ysy yua yud yur yus yuu yuy yyb yys yyu yyy