a-a a-b aaa aab aak aan aao aar aas aay ab- aba abb abk abn abo abr abs aby aka akb akk akn ako akr aks an- ana anb ank ann ano anr ans any aoa aob aok aon aoo aor aos ar- ara arb ark arn aro arr ars ary as- asa asb ask asn aso asr ass asy ay- aya ayk ayn ayo ayr ays baa bab bak ban bao bar bas bay bba bbb bbk bbn bbo bbr bbs bby bka bkb bkk bkn bko bkr bks bna bnb bnk bnn bno bnr bns boa bob bok bon boo bor bos boy bra brb brk brn bro brr brs bry bsa bsb bsk bsn bso bsr bss bsy by- bya byk byn byo byr bys ka- kaa kab kak kan kao kar kas kay kba kbb kbk kbn kbo kbr kbs kkb kkk kkn kkr kks kky kn- kna knk knn kno knr koa kob kok kon koo kor kos koy kra krk krn kro krr krs kry ksa ksb ksk ksn kso ksr kss kya kyn kyo kyr kys naa nab nak nan nao nar nas nay nba nbb nbk nbn nbo nbr nbs nka nkk nkn nko nkr nks nky nna nnb nnk nnn nno nns no- noa nob nok non noo nor nos noy nra nrb nrk nrn nro nrr nrs nry nsa nsb nsk nsn nso nsr nss nsy nya nyk nyn nyo nys nyy oaa oab oak oan oao oar oas ob- oba obb obk obn obo obr obs oby oka okb okk oko okr oks on- ona onb onk onn ono onr ons ony oo- ooa oob ook oon ooo oor oos or- ora orb ork orn oro orr ors ory os- osa osb osk osn oso osr oss oya oyo oys ra- raa rab rak ran rao rar ras ray rba rbb rbk rbn rbo rbr rbs rkb rkk rko rks rky rna rnb rnn rno rnr rns rny roa rob rok ron roo ror ros roy rra rrb rrk rrn rrr rrs rsa rsb rsk rsn rso rsr rss ry- rya ryk ryn ryo ryr rys ryy saa sab sak san sao sar sas say sba sbb sbk sbn sbo sbr sbs sby sk- ska skb skk sko skr sks sky sna snb snk snn sno snr sns sny soa sob sok son soo sor sos soy sr- sra srb srk srn sro srr srs sry ss- ssa ssb ssk ssn sso ssr sss sy- sya syb syk syn syr sys yaa yab yak yan yao yar yas yay ybr ybs yby yka ykk ykn yna ynk ynn yns yny yob yok yon yoo yor yos yoy yra yrn yro yrs ysa ysb ysk yso ysr yss ysy yyb yys yyy