a-a a-b a-c aaa aab aac aah aar aas aay ab- aba abb abc abh abr abs aby ac- aca acb acc ach acr acs acy aha ahb ahc ahh ahr ahs ahy ar- ara arb arc arh arr ars ary as- asa asb asc ash asr ass asy ay- aya ayc ayh ayr ays baa bab bac bah bar bas bay bba bbb bbc bbh bbr bbs bby bca bcb bcc bch bcr bcs bcy bha bhb bhc bhh bhr bhs bra brb brh brr brs bry bsa bsb bsc bsh bsr bss bsy by- bya byc byh byr bys c-- caa cab cac cah car cas cay cba cbb cbc cbh cbr cbs cby cca ccb ccc cch ccr ccs ch- cha chb chc chh chr chs chy cra crb crc crh crr crs cry csa csb csc csh csr css csy cya cyb cyc cyr cys haa hab hac hah har has hay hba hbb hbc hbh hbr hbs hby hca hcb hcc hch hcr hcs hcy hha hhb hhc hhh hhr hhs hhy hr- hra hrb hrc hrh hrr hrs hsa hsb hsc hsh hsr hss hsy hy- hya hyb hyc hyh hyr hys hyy ra- raa rab rac rah rar ras ray rba rbb rbc rbh rbr rbs rca rcb rcc rch rcr rcs rh- rha rhb rhc rhh rhr rhs rra rrb rrc rrh rrr rrs rsa rsb rsc rsh rsr rss ry- rya ryc ryr rys ryy saa sab sac sah sar sas say sba sbb sbc sbh sbr sbs sby sca scb scc sch scr scs sh- sha shb shc shh shr shs shy sr- sra srb src srh srr srs sry ss- ssa ssb ssc ssh ssr sss sy- sya syb syc syh syr sys yaa yab yac yah yar yas yay ybc ybr ybs yby yca ycc ych ycs ycy yha yhc yhs yra yrc yrs ysa ysb ysc ysr yss ysy yyb yyc yys yyy