a-a a-b aaa aab aad aae aah aao aax ab- aba abb abd abe abh abo abx ad- ada adb add ade adh ado adx aea aeb aed aee aeh aeo aex aha ahb ahd ahe ahh aho ahx aoa aob aod aoe aoh aoo aox ax- axa axe axh axo axx baa bab bad bae bah bao bax bba bbb bbd bbe bbh bbo bbx bda bdb bdd bde bdh bdo bdx be- bea beb bed bee beh beo bex bha bhb bhd bhe bhh bho bhx boa bob bod boe boh boo box bxb bxd bxo bxx daa dab dad dae dah dao dax dba dbb dbd dbe dbh dbo dbx dda ddb ddd dde ddh ddo ddx de- dea deb ded dee deh deo dex dh- dha dhb dhd dhe dhh dho doa dob dod doe doh doo dox dxd dxo dxx eaa eab ead eae eah eao eax eba ebb ebd ebe ebh ebo ebx ed- eda edb edd ede edh edo edx eea eeb eed eee eeo eex eha ehb ehd ehe ehh eho eo- eoa eob eod eoe eoh eoo ex- exa exd exe exh exo exx haa hab had hae hah hao hax hba hbb hbd hbe hbh hbo hbx hda hdb hdd hde hdh hdo hdx he- hea heb hed hee heh heo hex hha hhb hhd hhe hhh hho hoa hob hod hoe hoh hoo hox hxd oaa oab oad oae oah oao oax ob- oba obb obd obe obh obo obx oda odb odd ode odh odo oea oeb oed oee oeh oeo oex oha ohd ohe ohh oho oo- ooa oob ood ooh ooo oox ox- oxa oxb oxo oxx xaa xad xbe xbx xda xdb xde xdh xed xee xex xhd xoa xod xoo xox xxo xxx