a-be aaaa aaab aaac aaae aaba aabb aabc aabt aaca aacb aacc aace aact aaea aaec aata aatc aatt abaa abab abac abae abat abb- abba abbb abbe abbt abca abcb abcc abct abec abee abet abez abta abza ac-t acaa acab acac acae acat acba acca accc acce acct ace- acea acec acet acta actc acte actt aeac aecb aect aeta aetc aett at-t ataa atab atac atae atat atca atcc atea atec atee atez atta atte aza- azab azat azaz azca azet azza baaa baat baaz baba babb babe bac- baca bacc bace bact bacz baez bata batc bate batt batz baza baze bbbb bbeb bbet bcaa bcat bcbc bcca bccc bcec bcet bctc beat beba bebb bebe beca beeb beet beta betc bete bett betz beze btaa btcc btec bttb bzzt bzzz caaa caab caac caat caba cabe cac- caca cacc cace caec cat- cata catb catc cate catt catz caza caze cbac cbat cbbc cbca cbcc cbce cbct cbea cbec cbee cbet cbta cbtc ccaa ccab ccac ccat ccba ccbc ccca cccb cccc ccee cctb cctc cctt ceac ceat ceba cec- ceca cece cect ceeb ceec cet- ceta cete ceza ceze ctab ctae ctba ctca ctec ctta eaba eaca eacc eaec eata eate ebac ebba ebbc ebcc ecaa ecac ecat ecbc ecbe ecca eccb eccc ecce ecct ect- ecta ectc eeca eeea eeee eeta eetc eete eeze etat etbc etcc etec etee etta ette taa- taat taba tabb tabc tabe taca tacc tace tact taec tata tatb tate tatt tatz taza taze tazz tbca tbcb tbcc tbce tbta tcca tccc tctc teac teat teaz teba teca tect teec teet teez teta tete tett tetz teza tezz ttab ttbb tttt tzzt zaat zaba zaca zaza zcta zeae zeba zebe zeca zeta zete zeze zzzz