a-a a-b aaa aab aad aae aah aak aao aax ab- aba abb abd abe abh abk abo abx ad- ada adb add ade adh adk ado adx aea aeb aed aee aeh aek aeo aex aha ahb ahd ahe ahh ahk aho ahx aka akb akd ake akh akk ako aoa aob aod aoe aoh aok aoo aox ax- axa axe axh axk axo axx baa bab bad bae bah bak bao bax bba bbb bbd bbe bbh bbk bbo bbx bda bdb bdd bde bdh bdk bdo bdx be- bea beb bed bee beh bek beo bex bha bhb bhd bhe bhh bhk bho bhx bka bkb bke bkk bko bkx boa bob bod boe boh bok boo box bxb bxd bxo bxx daa dab dad dae dah dak dao dax dba dbb dbd dbe dbh dbk dbo dbx dda ddb ddd dde ddh ddk ddo ddx de- dea deb ded dee deh dek deo dex dh- dha dhb dhd dhe dhh dhk dho dka dkb dke dkk dko dkx doa dob dod doe doh dok doo dox dxd dxo dxx eaa eab ead eae eah eak eao eax eba ebb ebd ebe ebh ebk ebo ebx ed- eda edb edd ede edh edk edo edx eea eeb eed eee eek eeo eex eha ehb ehd ehe ehh eho eka ekb ekd eke ekh eko eo- eoa eob eod eoe eoh eok eoo ex- exa exd exe exh exo exx haa hab had hae hah hak hao hax hba hbb hbd hbe hbh hbk hbo hbx hda hdb hdd hde hdh hdk hdo hdx he- hea heb hed hee heh hek heo hex hha hhb hhd hhe hhh hhk hho hka hkb hkd hkh hkk hko hoa hob hod hoe hoh hok hoo hox hxd ka- kaa kab kad kae kah kak kao kax kba kbb kbd kbe kbh kbk kbo kbx kda kdb kde kdh kdk kdo kdx ke- kea keb ked kee keh kek keo kex kha khe khh khk kho kkb kke kkh kkk koa kob kod koe koh kok koo kxo oaa oab oad oae oah oak oao oax ob- oba obb obd obe obh obk obo obx oda odb odd ode odh odo oea oeb oed oee oeh oeo oex oha ohd ohe ohh oho oka okb okd oke okk oko oo- ooa oob ood ooh ook ooo oox ox- oxa oxb oxo oxx xaa xad xak xbe xbx xda xdb xde xdh xdk xed xee xex xhd xkb xke xoa xod xok xoo xox xxo xxx