a-a a-b aaa aab aad aah aak aao aar aas ab- aba abb abd abh abk abo abr abs ad- ada adb add adh adk ado adr ads aha ahb ahd ahh ahk aho ahr ahs aka akb akd akh akk ako akr aks aoa aob aod aoh aok aoo aor aos ar- ara arb ard arh ark aro arr ars as- asa asb asd ash ask aso asr ass baa bab bad bah bak bao bar bas bba bbb bbd bbh bbk bbo bbr bbs bda bdb bdd bdh bdk bdo bdr bds bha bhb bhd bhh bhk bho bhr bhs bka bkb bkk bko bkr bks boa bob bod boh bok boo bor bos bra brb brd brh brk bro brr brs bsa bsb bsd bsh bsk bso bsr bss daa dab dad dah dak dao dar das dba dbb dbd dbh dbk dbo dbr dbs dda ddb ddd ddh ddk ddo ddr dds dh- dha dhb dhd dhh dhk dho dhr dhs dka dkb dkk dko dkr dks doa dob dod doh dok doo dor dos dra drb drd drk dro drr drs dsa dsb dsd dsh dsk dso dsr dss haa hab had hah hak hao har has hba hbb hbd hbh hbk hbo hbr hbs hda hdb hdd hdh hdk hdo hdr hds hha hhb hhd hhh hhk hho hhr hhs hka hkb hkd hkh hkk hko hkr hks hoa hob hod hoh hok hoo hor hos hr- hra hrb hrd hrh hrk hro hrr hrs hsa hsb hsd hsh hsk hsr hss ka- kaa kab kad kah kak kao kar kas kba kbb kbd kbh kbk kbo kbr kbs kda kdb kdh kdk kdo kdr kds kha khh khk kho khr khs kkb kkh kkk kkr kks koa kob kod koh kok koo kor kos kra krd krk kro krr krs ksa ksb ksd ksh ksk kso ksr kss oaa oab oad oah oak oao oar oas ob- oba obb obd obh obk obo obr obs oda odb odd odh odo odr ods oha ohd ohh oho ohr ohs oka okb okd okk oko okr oks oo- ooa oob ood ooh ook ooo oor oos or- ora orb ord orh ork oro orr ors os- osa osb osd osh osk oso osr oss ra- raa rab rad rah rak rao rar ras rba rbb rbd rbh rbk rbo rbr rbs rda rdb rdd rdh rdo rdr rds rh- rha rhb rhd rhh rho rhr rhs rkb rkk rko rks roa rob rod roh rok roo ror ros rra rrb rrd rrh rrk rrr rrs rsa rsb rsd rsh rsk rso rsr rss saa sab sad sah sak sao sar sas sba sbb sbd sbh sbk sbo sbr sbs sda sdb sdd sdh sdk sdo sdr sds sh- sha shb shd shh shk sho shr shs sk- ska skb skd skh skk sko skr sks soa sob sod soh sok soo sor sos sr- sra srb srd srh srk sro srr srs ss- ssa ssb ssd ssh ssk sso ssr sss