a-a a-b aaa aab aad aae aak aau ab- aba abb abd abe abk abu ad- ada adb add ade adk adu aea aeb aed aee aek aeu aka akb akd ake akk aku au- aua aub aud aue auk b-u baa bab bad bae bak bau bba bbb bbd bbe bbk bbu bda bdb bdd bde bdk bdu be- bea beb bed bee bek beu bka bkb bke bkk bua bub bud bue buk buu daa dab dad dae dak dau dba dbb dbd dbe dbk dbu dda ddb ddd dde ddk ddu de- dea deb ded dee dek deu dka dkb dke dkk dku dua dub dud due duk eaa eab ead eae eak eau eba ebb ebd ebe ebk ebu ed- eda edb edd ede edk edu eea eeb eed eee eek eka ekb ekd eke eku eu- eua eub eud eue ka- kaa kab kad kae kak kau kba kbb kbd kbe kbk kbu kda kdb kde kdk kdu ke- kea keb ked kee kek kkb kke kkk kku kub kud kue kuk kuu ua- uaa uab uad uae uak uau uba ubb ube ubk ubu uda udb udd ude udk udu uea ueb ued uee uka ukb uke ukk uku uua uue uuu