a-a a-b aaa aab aad aag aah aak aao ab- aba abb abd abg abh abk abo ad- ada adb add adg adh adk ado ag- aga agb agd agg agh agk ago aha ahb ahd ahg ahh ahk aho aka akb akd akg akh akk ako aoa aob aod aog aoh aok aoo baa bab bad bag bah bak bao bba bbb bbd bbg bbh bbk bbo bda bdb bdd bdg bdh bdk bdo bga bgb bgd bgg bgh bgk bgo bha bhb bhd bhg bhh bhk bho bka bkb bkg bkk bko boa bob bod bog boh bok boo daa dab dad dag dah dak dao dba dbb dbd dbg dbh dbk dbo dda ddb ddd ddg ddh ddk ddo dga dgd dgg dgh dgk dh- dha dhb dhd dhh dhk dho dka dkb dkg dkk dko doa dob dod dog doh dok doo g-d gaa gab gad gag gah gak gao gba gbd gbg gbh gbk gbo gda gdb gdd gdh gdk gdo gga ggb ggd ggg ggh ggo gha ghb ghd ghg ghh gho gka gkb gkd gkh gko goa gob god gog goh gok goo haa hab had hag hah hak hao hba hbb hbd hbg hbh hbk hbo hda hdb hdd hdg hdh hdk hdo hga hgb hgg hgh hgk hgo hha hhb hhd hhg hhh hhk hho hka hkb hkd hkg hkh hkk hko hoa hob hod hog hoh hok hoo ka- kaa kab kad kag kah kak kao kba kbb kbd kbh kbk kbo kda kdb kdg kdh kdk kdo kga kgb kgd kgh kgo kha khh khk kho kkb kkh kkk koa kob kod kog koh kok koo oaa oab oad oag oah oak oao ob- oba obb obd obg obh obk obo oda odb odd odg odh odo oga ogd ogg ogh ogo oha ohd ohg ohh oho oka okb okd okg okk oko oo- ooa oob ood oog ooh ook ooo