a-a a-b aaa aab aad aah aao aar aas ab- aba abb abd abh abo abr abs ad- ada adb add adh ado adr ads aha ahb ahd ahh aho ahr ahs aoa aob aod aoh aoo aor aos ar- ara arb ard arh aro arr ars as- asa asb asd ash aso asr ass baa bab bad bah bao bar bas bba bbb bbd bbh bbo bbr bbs bda bdb bdd bdh bdo bdr bds bha bhb bhd bhh bho bhr bhs boa bob bod boh boo bor bos bra brb brd brh bro brr brs bsa bsb bsd bsh bso bsr bss daa dab dad dah dao dar das dba dbb dbd dbh dbo dbr dbs dda ddb ddd ddh ddo ddr dds dh- dha dhb dhd dhh dho dhr dhs doa dob dod doh doo dor dos dra drb drd dro drr drs dsa dsb dsd dsh dso dsr dss haa hab had hah hao har has hba hbb hbd hbh hbo hbr hbs hda hdb hdd hdh hdo hdr hds hha hhb hhd hhh hho hhr hhs hoa hob hod hoh hoo hor hos hr- hra hrb hrd hrh hro hrr hrs hsa hsb hsd hsh hsr hss oaa oab oad oah oao oar oas ob- oba obb obd obh obo obr obs oda odb odd odh odo odr ods oha ohd ohh oho ohr ohs oo- ooa oob ood ooh ooo oor oos or- ora orb ord orh oro orr ors os- osa osb osd osh oso osr oss ra- raa rab rad rah rao rar ras rba rbb rbd rbh rbo rbr rbs rda rdb rdd rdh rdo rdr rds rh- rha rhb rhd rhh rho rhr rhs roa rob rod roh roo ror ros rra rrb rrd rrh rrr rrs rsa rsb rsd rsh rso rsr rss saa sab sad sah sao sar sas sba sbb sbd sbh sbo sbr sbs sda sdb sdd sdh sdo sdr sds sh- sha shb shd shh sho shr shs soa sob sod soh soo sor sos sr- sra srb srd srh sro srr srs ss- ssa ssb ssd ssh sso ssr sss