costa ocsta csota scota oscta socta cotsa octsa ctosa tcosa otcsa tocsa cstoa sctoa ctsoa tcsoa stcoa tscoa ostca sotca otsca tosca stoca tsoca cosat ocsat csoat scoat oscat socat coast ocast caost acost oacst aocst csaot scaot casot acsot sacot ascot osact soact oasct aosct saoct asoct cotas octas ctoas tcoas otcas tocas coats ocats caots acots oacts aocts ctaos tcaos catos actos tacos atcos otacs toacs oatcs aotcs taocs atocs cstao sctao ctsao tcsao stcao tscao csato scato casto acsto sacto ascto ctaso tcaso catso actso tacso atcso staco tsaco satco astco tasco atsco ostac sotac otsac tosac stoac tsoac osatc soatc oastc aostc saotc asotc otasc toasc oatsc aotsc taosc atosc staoc tsaoc satoc astoc tasoc atsoc
Note: these 'words' (valid or invalid) are all the permutations of the word costa. These words are obtained by scrambling the letters in costa.