a-a a-b aaa aab aah aar aas aay ab- aba abb abh abr abs aby aha ahb ahh ahr ahs ahy ar- ara arb arh arr ars ary as- asa asb ash asr ass asy ay- aya ayh ayr ays baa bab bah bar bas bay bba bbb bbh bbr bbs bby bha bhb bhh bhr bhs bra brb brh brr brs bry bsa bsb bsh bsr bss bsy by- bya byh byr bys haa hab hah har has hay hba hbb hbh hbr hbs hby hha hhb hhh hhr hhs hhy hr- hra hrb hrh hrr hrs hsa hsb hsh hsr hss hsy hy- hya hyb hyh hyr hys hyy ra- raa rab rah rar ras ray rba rbb rbh rbr rbs rh- rha rhb rhh rhr rhs rra rrb rrh rrr rrs rsa rsb rsh rsr rss ry- rya ryr rys ryy saa sab sah sar sas say sba sbb sbh sbr sbs sby sh- sha shb shh shr shs shy sr- sra srb srh srr srs sry ss- ssa ssb ssh ssr sss sy- sya syb syh syr sys yaa yab yah yar yas yay ybr ybs yby yha yhs yra yrs ysa ysb ysr yss ysy yyb yys yyy