sisal issal ssial ssial issal sisal siasl isasl saisl asisl iassl aissl ssail ssail sasil assil sasil assil isasl siasl iassl aissl saisl asisl sisla issla ssila ssila issla sisla silsa islsa slisa lsisa ilssa lissa sslia sslia slsia lssia slsia lssia islsa silsa ilssa lissa slisa lsisa sials isals sails asils iasls aisls silas islas slias lsias ilsas lisas salis aslis slais lsais alsis lasis ialss ailss ilass liass aliss laiss ssali ssali sasli assli sasli assli sslai sslai slsai lssai slsai lssai salsi aslsi slasi lsasi alssi lassi salsi aslsi slasi lsasi alssi lassi isals sials iasls aisls sails asils islas silas ilsas lisas slias lsias ialss ailss ilass liass aliss laiss salis aslis slais lsais alsis lasis
Note: these 'words' (valid or invalid) are all the permutations of the word sisal. These words are obtained by scrambling the letters in sisal.