a-a a-b aaa aab aad aao aar aas aay ab- aba abb abd abo abr abs aby ad- ada adb add ado adr ads ady aoa aob aod aoo aor aos ar- ara arb ard aro arr ars ary as- asa asb asd aso asr ass asy ay- aya ayd ayo ayr ays baa bab bad bao bar bas bay bba bbb bbd bbo bbr bbs bby bda bdb bdd bdo bdr bds bdy boa bob bod boo bor bos boy bra brb brd bro brr brs bry bsa bsb bsd bso bsr bss bsy by- bya byd byo byr bys daa dab dad dao dar das day dba dbb dbd dbo dbr dbs dby dda ddb ddd ddo ddr dds ddy doa dob dod doo dor dos doy dra drb drd dro drr drs dry dsa dsb dsd dso dsr dss dsy dy- dya dyb dyd dyo dyr dys dyy oaa oab oad oao oar oas ob- oba obb obd obo obr obs oby oda odb odd odo odr ods oo- ooa oob ood ooo oor oos or- ora orb ord oro orr ors ory os- osa osb osd oso osr oss oya oyd oyo oys ra- raa rab rad rao rar ras ray rba rbb rbd rbo rbr rbs rda rdb rdd rdo rdr rds rdy roa rob rod roo ror ros roy rra rrb rrd rrr rrs rsa rsb rsd rso rsr rss ry- rya ryd ryo ryr rys ryy saa sab sad sao sar sas say sba sbb sbd sbo sbr sbs sby sda sdb sdd sdo sdr sds sdy soa sob sod soo sor sos soy sr- sra srb srd sro srr srs sry ss- ssa ssb ssd sso ssr sss sy- sya syb syd syr sys yaa yab yad yao yar yas yay ybr ybs yby yda ydo yds ydy yob yod yoo yor yos yoy yra yro yrs ysa ysb yso ysr yss ysy yyb yys yyy