csast scast casst acsst sacst ascst cssat scsat cssat scsat sscat sscat casst acsst csast scast ascst sacst sasct assct ssact ssact assct sasct csats scats casts acsts sacts ascts cstas sctas ctsas tcsas stcas tscas catss actss ctass tcass atcss tacss satcs astcs stacs tsacs atscs tascs cssta scsta cssta scsta sscta sscta cstsa sctsa ctssa tcssa stcsa tscsa cstsa sctsa ctssa tcssa stcsa tscsa sstca sstca stsca tssca stsca tssca casts acsts csats scats ascts sacts catss actss ctass tcass atcss tacss cstas sctas ctsas tcsas stcas tscas astcs satcs atscs tascs stacs tsacs sastc asstc ssatc ssatc asstc sastc satsc astsc stasc tsasc atssc tassc sstac sstac stsac tssac stsac tssac astsc satsc atssc tassc stasc tsasc
Note: these 'words' (valid or invalid) are all the permutations of the word csast. These words are obtained by scrambling the letters in csast.