aaaa aaac aaae aaca aacc aace aact aaea aaec aata aatc aatt ac-t acaa acac acae acat acca accc acce acct ace- acea acec acet acta actc acte actt aeac aect aeta aetc aett aetx at-t at-x ataa atac atae atat atax atca atcc atea atec atee atex atta atte axat axce caaa caac caat cac- caca cacc cace caec caex cat- cata catc cate catt caxa ccaa ccac ccat ccca cccc ccee cctc cctt ceac ceat cec- ceca cece cect ceec cet- ceta cete cexe ctae ctca ctec ctta cxxx eaca eacc eaec eata eate ecaa ecac ecat ecca eccc ecce ecct ect- ecta ectc eeca eeea eeee eeta eetc eete eext etat etcc etec etee etta ette exa- exec exta exte taa- taat taca tacc tace tact taec tata tate tatt tax- taxa taxe taxt tcca tccc tctc teac teat teca tect teec teet teta tete tett tetx texa text tttt txaa xace xact xate xcat xexe xtea xxxx