a-be aaaa aaab aaad aaae aaaf aaba aabb aabd aabt aada aade aadt aaea aafa aafb aafd aaff aata aatf aatt abaa abab abad abae abaf abat abb- abba abbb abbe abbt abda abed abee abet abff abta adaa adab adad adae adat adba adda addd adde adea adeb adee adet adfa adta aeaf aede aedt aeta aetf aett afaa afad afat afdb afee afet affa afft afta afte at-t ataa atab atad atae atat atdt atea ated atee atef atfb atfe atta atte baaa baad baaf baat baba babb babe bada badb badd bade baed baff baft bata bate batf batt bbad bbbb bbdd bbeb bbet bead beaf beat beba bebb bebe beda bede beeb beed beef beet befa befe beff beft beta bete bett bfta bftt btaa btaf btdt bttb daab daad daae daba dabb dabt dada dade daeb dafa dafe daff daft data date datt dbtt dddd dead deae deaf deba debe debt deda dedd dede deeb deed deef deet defe deff deft deta dete dfaf dfdt dffa dtaa dted eaaf eaba eada eadb eadd eafb eata eate ebba ebed edad edda edde ede- edea edfa edta eede eeea eeee eefa eefe eeta eete efab efda efet effa eft- efta etat etee etfa etfb etfe etta ette faaa faad faba fabd fabe fada fadd fade faeb fafa fafe faff fata fate fatf fatt fead feaf feat feba feda fede feeb feed feet fefe feff feta fete fett ffee ffff fftf ftea taa- taaf taat taba tabb tabe tada tade tafa tafe taff taft tata tatb tate tatt tbaf tbta tddb tdff tead teat teba teda tedd tede teed teef teet teff teft teta tete tett tfae tfeb ttab ttbb ttfa ttff tttt