a-a a-b aaa aab aan aao aar aas aay ab- aba abb abn abo abr abs aby an- ana anb ann ano anr ans any aoa aob aon aoo aor aos ar- ara arb arn aro arr ars ary as- asa asb asn aso asr ass asy ay- aya ayn ayo ayr ays baa bab ban bao bar bas bay bba bbb bbn bbo bbr bbs bby bna bnb bnn bno bnr bns boa bob bon boo bor bos boy bra brb brn bro brr brs bry bsa bsb bsn bso bsr bss bsy by- bya byn byo byr bys naa nab nan nao nar nas nay nba nbb nbn nbo nbr nbs nna nnb nnn nno nns no- noa nob non noo nor nos noy nra nrb nrn nro nrr nrs nry nsa nsb nsn nso nsr nss nsy nya nyn nyo nys nyy oaa oab oan oao oar oas ob- oba obb obn obo obr obs oby on- ona onb onn ono onr ons ony oo- ooa oob oon ooo oor oos or- ora orb orn oro orr ors ory os- osa osb osn oso osr oss oya oyo oys ra- raa rab ran rao rar ras ray rba rbb rbn rbo rbr rbs rna rnb rnn rno rnr rns rny roa rob ron roo ror ros roy rra rrb rrn rrr rrs rsa rsb rsn rso rsr rss ry- rya ryn ryo ryr rys ryy saa sab san sao sar sas say sba sbb sbn sbo sbr sbs sby sna snb snn sno snr sns sny soa sob son soo sor sos soy sr- sra srb srn sro srr srs sry ss- ssa ssb ssn sso ssr sss sy- sya syb syn syr sys yaa yab yan yao yar yas yay ybr ybs yby yna ynn yns yny yob yon yoo yor yos yoy yra yrn yro yrs ysa ysb yso ysr yss ysy yyb yys yyy