a-a a-b aaa aab aad aao aar aas aau aay ab- aba abb abd abo abr abs abu aby ad- ada adb add ado adr ads adu ady aoa aob aod aoo aor aos aou ar- ara arb ard aro arr ars aru ary as- asa asb asd aso asr ass asu asy au- aua aub aud auo aur aus ay- aya ayd ayo ayr ays ayu b-u baa bab bad bao bar bas bau bay bba bbb bbd bbo bbr bbs bbu bby bda bdb bdd bdo bdr bds bdu bdy boa bob bod boo bor bos bou boy bra brb brd bro brr brs bru bry bsa bsb bsd bso bsr bss bsu bsy bua bub bud buo bur bus buu buy by- bya byd byo byr bys byu daa dab dad dao dar das dau day dba dbb dbd dbo dbr dbs dbu dby dda ddb ddd ddo ddr dds ddu ddy doa dob dod doo dor dos dou doy dra drb drd dro drr drs dru dry dsa dsb dsd dso dsr dss dsu dsy dua dub dud duo dur dus duy dy- dya dyb dyd dyo dyr dys dyu dyy oaa oab oad oao oar oas oau ob- oba obb obd obo obr obs obu oby oda odb odd odo odr ods odu oo- ooa oob ood ooo oor oos or- ora orb ord oro orr ors oru ory os- osa osb osd oso osr oss osu ou- oua oud ouo our ous oya oyd oyo oys ra- raa rab rad rao rar ras rau ray rba rbb rbd rbo rbr rbs rbu rda rdb rdd rdo rdr rds rdu rdy roa rob rod roo ror ros rou roy rra rrb rrd rrr rrs rru rsa rsb rsd rso rsr rss rsu rua rub rud ruo rur rus ruu ruy ry- rya ryd ryo ryr rys ryu ryy saa sab sad sao sar sas sau say sba sbb sbd sbo sbr sbs sbu sby sda sdb sdd sdo sdr sds sdu sdy soa sob sod soo sor sos sou soy sr- sra srb srd sro srr srs sry ss- ssa ssb ssd sso ssr sss ssu sua sub sud suo sur sus suu suy sy- sya syb syd syr sys syu ua- uaa uab uad uao uar uas uau uay uba ubb ubo ubr ubs ubu uby uda udb udd udo udr uds udu uoa uob uod uoo uor uos ur- ura urb urd uro urr urs uru ury usa usb usd uso usr uss usu uua uur uus uuu uyo uys uyu yaa yab yad yao yar yas yau yay ybr ybs yby yda ydo yds ydy yob yod yoo yor yos you yoy yra yro yrs yru ysa ysb yso ysr yss ysu ysy yua yud yuo yur yus yuu yuy yyb yys yyu yyy