a-be aaaa aaab aaad aaae aaba aabb aabd aabt aada aade aadt aaea aata aatt abaa abab abad abae abat abb- abba abbb abbe abbt abda abed abee abet abta adaa adab adad adae adat adba adda addd adde adea adeb adee adet adta aede aedt aeta aett at-t ataa atab atad atae atat atdt atea ated atee atta atte baaa baad baat baba babb babe bada badb badd bade baed bata bate batt bbad bbbb bbdd bbeb bbet bead beat beba bebb bebe beda bede beeb beed beet beta bete bett btaa btdt bttb daab daad daae daba dabb dabt dada dade daeb data date datt dbtt dddd dead deae deba debe debt deda dedd dede deeb deed deet deta dete dtaa dted eaba eada eadb eadd eata eate ebba ebed edad edda edde ede- edea edta eede eeea eeee eeta eete etat etee etta ette taa- taat taba tabb tabe tada tade tata tatb tate tatt tbta tddb tead teat teba teda tedd tede teed teet teta tete tett ttab ttbb tttt