a-be aaaa aaab aaad aaae aaba aabb aabd aada aade aadu aaea abaa abab abad abae abau abax abb- abba abbb abbe abda abdu abed abee abua abud abue adaa adab adad adae adba adda addd adde addu adea adeb adee adua adub adue aede auaa aube aude auxa axed ba-x baaa baad baba babb babe babu bada badb badd bade badu baed bau- baud baux bbad bbau bbbb bbdd bbeb bead beau beba bebb bebe beda bede bedu beeb beed beux buad buba bubb bube bubu buda budb budd bude budu buea bueu buxa daab daad daae daau daba dabb dabu dada dade dadu daeb daeu daub daud daue daux dddd ddub dead deae deau deba debe debu deda dedd dede dedu deeb deed deua deue deux dex- dexa dexe duaa duab duad dub- duba dubb dube dubu duda dudd dude dudu dxab dxbe dxed dxue dxxx eaba eada eadb eadd eaux ebba ebed edad edax edda edde ede- edea edex eede eedu eeea eeee euba eude exa- exda exed uaua ubba ubbe ubud udaa udad udau udea ueba ueda uuuu uxue x-ed xbee xexe xuda xuxa xuxu xxxx