a-a a-b aaa aab aad aae aao aau ab- aba abb abd abe abo abu ad- ada adb add ade ado adu aea aeb aed aee aeo aeu aoa aob aod aoe aoo aou au- aua aub aud aue auo b-u baa bab bad bae bao bau bba bbb bbd bbe bbo bbu bda bdb bdd bde bdo bdu be- bea beb bed bee beo beu boa bob bod boe boo bou bua bub bud bue buo buu daa dab dad dae dao dau dba dbb dbd dbe dbo dbu dda ddb ddd dde ddo ddu de- dea deb ded dee deo deu doa dob dod doe doo dou dua dub dud due duo eaa eab ead eae eao eau eba ebb ebd ebe ebo ebu ed- eda edb edd ede edo edu eea eeb eed eee eeo eo- eoa eob eod eoe eoo eou eu- eua eub eud eue oaa oab oad oae oao oau ob- oba obb obd obe obo obu oda odb odd ode odo odu oea oeb oed oee oeo oo- ooa oob ood ooo ou- oua oud oue ouo ua- uaa uab uad uae uao uau uba ubb ube ubo ubu uda udb udd ude udo udu uea ueb ued uee uoa uob uod uoe uoo uua uue uuu