a-a a-b aaa aab aan aar aas aay ab- aba abb abn abr abs aby an- ana anb ann anr ans any ar- ara arb arn arr ars ary as- asa asb asn asr ass asy ay- aya ayn ayr ays baa bab ban bar bas bay bba bbb bbn bbr bbs bby bna bnb bnn bnr bns bra brb brn brr brs bry bsa bsb bsn bsr bss bsy by- bya byn byr bys naa nab nan nar nas nay nba nbb nbn nbr nbs nna nnb nnn nns nra nrb nrn nrr nrs nry nsa nsb nsn nsr nss nsy nya nyn nys nyy ra- raa rab ran rar ras ray rba rbb rbn rbr rbs rna rnb rnn rnr rns rny rra rrb rrn rrr rrs rsa rsb rsn rsr rss ry- rya ryn ryr rys ryy saa sab san sar sas say sba sbb sbn sbr sbs sby sna snb snn snr sns sny sr- sra srb srn srr srs sry ss- ssa ssb ssn ssr sss sy- sya syb syn syr sys yaa yab yan yar yas yay ybr ybs yby yna ynn yns yny yra yrn yrs ysa ysb ysr yss ysy yyb yys yyy