a-a a-b a-c aaa aab aac aah aao aar aas aay ab- aba abb abc abh abo abr abs aby ac- aca acb acc ach aco acr acs acy aha ahb ahc ahh aho ahr ahs ahy aoa aob aoc aoh aoo aor aos ar- ara arb arc arh aro arr ars ary as- asa asb asc ash aso asr ass asy ay- aya ayc ayh ayo ayr ays baa bab bac bah bao bar bas bay bba bbb bbc bbh bbo bbr bbs bby bca bcb bcc bch bco bcr bcs bcy bha bhb bhc bhh bho bhr bhs boa bob boc boh boo bor bos boy bra brb brh bro brr brs bry bsa bsb bsc bsh bso bsr bss bsy by- bya byc byh byo byr bys c-- caa cab cac cah cao car cas cay cba cbb cbc cbh cbo cbr cbs cby cca ccb ccc cch cco ccr ccs ch- cha chb chc chh cho chr chs chy co- coa cob coc coh coo cor cos coy cra crb crc crh cro crr crs cry csa csb csc csh cso csr css csy cya cyb cyc cyo cyr cys haa hab hac hah hao har has hay hba hbb hbc hbh hbo hbr hbs hby hca hcb hcc hch hco hcr hcs hcy hha hhb hhc hhh hho hhr hhs hhy hoa hob hoc hoh hoo hor hos hoy hr- hra hrb hrc hrh hro hrr hrs hsa hsb hsc hsh hsr hss hsy hy- hya hyb hyc hyh hyo hyr hys hyy oaa oab oac oah oao oar oas ob- oba obb obc obh obo obr obs oby oc- oca ocb occ och oco ocr ocs oha ohc ohh oho ohr ohs oo- ooa oob ooc ooh ooo oor oos or- ora orb orc orh oro orr ors ory os- osa osb osc osh oso osr oss oya oyo oys ra- raa rab rac rah rao rar ras ray rba rbb rbc rbh rbo rbr rbs rca rcb rcc rch rco rcr rcs rh- rha rhb rhc rhh rho rhr rhs roa rob roc roh roo ror ros roy rra rrb rrc rrh rrr rrs rsa rsb rsc rsh rso rsr rss ry- rya ryc ryo ryr rys ryy saa sab sac sah sao sar sas say sba sbb sbc sbh sbo sbr sbs sby sca scb scc sch sco scr scs sh- sha shb shc shh sho shr shs shy soa sob soc soh soo sor sos soy sr- sra srb src srh sro srr srs sry ss- ssa ssb ssc ssh sso ssr sss sy- sya syb syc syh syr sys yaa yab yac yah yao yar yas yay ybc ybr ybs yby yca ycc ych yco ycs ycy yha yhc yhs yob yoc yoo yor yos yoy yra yrc yro yrs ysa ysb ysc yso ysr yss ysy yyb yyc yys yyy