a-a a-b aaa aab aad aah aak aao aas ab- aba abb abd abh abk abo abs ad- ada adb add adh adk ado ads aha ahb ahd ahh ahk aho ahs aka akb akd akh akk ako aks aoa aob aod aoh aok aoo aos as- asa asb asd ash ask aso ass baa bab bad bah bak bao bas bba bbb bbd bbh bbk bbo bbs bda bdb bdd bdh bdk bdo bds bha bhb bhd bhh bhk bho bhs bka bkb bkk bko bks boa bob bod boh bok boo bos bsa bsb bsd bsh bsk bso bss daa dab dad dah dak dao das dba dbb dbd dbh dbk dbo dbs dda ddb ddd ddh ddk ddo dds dh- dha dhb dhd dhh dhk dho dhs dka dkb dkk dko dks doa dob dod doh dok doo dos dsa dsb dsd dsh dsk dso dss haa hab had hah hak hao has hba hbb hbd hbh hbk hbo hbs hda hdb hdd hdh hdk hdo hds hha hhb hhd hhh hhk hho hhs hka hkb hkd hkh hkk hko hks hoa hob hod hoh hok hoo hos hsa hsb hsd hsh hsk hss ka- kaa kab kad kah kak kao kas kba kbb kbd kbh kbk kbo kbs kda kdb kdh kdk kdo kds kha khh khk kho khs kkb kkh kkk kks koa kob kod koh kok koo kos ksa ksb ksd ksh ksk kso kss oaa oab oad oah oak oao oas ob- oba obb obd obh obk obo obs oda odb odd odh odo ods oha ohd ohh oho ohs oka okb okd okk oko oks oo- ooa oob ood ooh ook ooo oos os- osa osb osd osh osk oso oss saa sab sad sah sak sao sas sba sbb sbd sbh sbk sbo sbs sda sdb sdd sdh sdk sdo sds sh- sha shb shd shh shk sho shs sk- ska skb skd skh skk sko sks soa sob sod soh sok soo sos ss- ssa ssb ssd ssh ssk sso sss