a-a a-b aaa aab aad aah aak aao aav ab- aba abb abd abh abk abo abv ad- ada adb add adh adk ado adv aha ahb ahd ahh ahk aho ahv aka akb akd akh akk ako akv aoa aob aod aoh aok aoo aov av- ava avb avd avh avk avo baa bab bad bah bak bao bav bba bbb bbd bbh bbk bbo bda bdb bdd bdh bdk bdo bdv bha bhb bhd bhh bhk bho bhv bka bkb bkk bko bkv boa bob bod boh bok boo bov bva bvb bvd bvh bvk bvo bvv daa dab dad dah dak dao dav dba dbb dbd dbh dbk dbo dbv dda ddb ddd ddh ddk ddo dh- dha dhb dhd dhh dhk dho dka dkb dkk dko doa dob dod doh dok doo dov dva dvb dvd dvh dvk haa hab had hah hak hao hav hba hbb hbd hbh hbk hbo hbv hda hdb hdd hdh hdk hdo hdv hha hhb hhd hhh hhk hho hhv hka hkb hkd hkh hkk hko hoa hob hod hoh hok hoo hov hv- hva hvb hvd hvk hvo hvv ka- kaa kab kad kah kak kao kav kba kbb kbd kbh kbk kbo kda kdb kdh kdk kdo kha khh khk kho khv kkb kkh kkk kkv koa kob kod koh kok koo kva kvb kvh kvk kvo kvv oaa oab oad oah oak oao oav ob- oba obb obd obh obk obo obv oda odb odd odh odo odv oha ohd ohh oho oka okb okd okk oko oo- ooa oob ood ooh ook ooo oov ov- ova ovb ovd ovh ovo ovv v-a vaa vab vad vah vak vao vav vba vbd vbh vbk vbo vbv vdb vdd vdh vdk vdo vdv vh- vha vhb vhd vho vka vkb voa vob vod voh vok voo vov vva vvb vvo vvv