a-a a-b aaa aab aad aak aao aar aas aay ab- aba abb abd abk abo abr abs aby ad- ada adb add adk ado adr ads ady aka akb akd akk ako akr aks aoa aob aod aok aoo aor aos ar- ara arb ard ark aro arr ars ary as- asa asb asd ask aso asr ass asy ay- aya ayd ayk ayo ayr ays baa bab bad bak bao bar bas bay bba bbb bbd bbk bbo bbr bbs bby bda bdb bdd bdk bdo bdr bds bdy bka bkb bkk bko bkr bks boa bob bod bok boo bor bos boy bra brb brd brk bro brr brs bry bsa bsb bsd bsk bso bsr bss bsy by- bya byd byk byo byr bys daa dab dad dak dao dar das day dba dbb dbd dbk dbo dbr dbs dby dda ddb ddd ddk ddo ddr dds ddy dka dkb dkk dko dkr dks doa dob dod dok doo dor dos doy dra drb drd drk dro drr drs dry dsa dsb dsd dsk dso dsr dss dsy dy- dya dyb dyd dyk dyo dyr dys dyy ka- kaa kab kad kak kao kar kas kay kba kbb kbd kbk kbo kbr kbs kda kdb kdk kdo kdr kds kdy kkb kkk kkr kks kky koa kob kod kok koo kor kos koy kra krd krk kro krr krs kry ksa ksb ksd ksk kso ksr kss kya kyd kyo kyr kys oaa oab oad oak oao oar oas ob- oba obb obd obk obo obr obs oby oda odb odd odo odr ods oka okb okd okk oko okr oks oo- ooa oob ood ook ooo oor oos or- ora orb ord ork oro orr ors ory os- osa osb osd osk oso osr oss oya oyd oyo oys ra- raa rab rad rak rao rar ras ray rba rbb rbd rbk rbo rbr rbs rda rdb rdd rdo rdr rds rdy rkb rkk rko rks rky roa rob rod rok roo ror ros roy rra rrb rrd rrk rrr rrs rsa rsb rsd rsk rso rsr rss ry- rya ryd ryk ryo ryr rys ryy saa sab sad sak sao sar sas say sba sbb sbd sbk sbo sbr sbs sby sda sdb sdd sdk sdo sdr sds sdy sk- ska skb skd skk sko skr sks sky soa sob sod sok soo sor sos soy sr- sra srb srd srk sro srr srs sry ss- ssa ssb ssd ssk sso ssr sss sy- sya syb syd syk syr sys yaa yab yad yak yao yar yas yay ybr ybs yby yda ydo yds ydy yka ykk yob yod yok yoo yor yos yoy yra yro yrs ysa ysb ysk yso ysr yss ysy yyb yys yyy