silds islds slids lsids ilsds lisds sidls isdls sdils dsils idsls disls sldis lsdis sdlis dslis ldsis dlsis ildss lidss idlss dilss ldiss dliss silsd islsd slisd lsisd ilssd lissd sisld issld ssild ssild issld sisld slsid lssid sslid sslid lssid slsid ilssd lissd islsd silsd lsisd slisd sidsl isdsl sdisl dsisl idssl dissl sisdl issdl ssidl ssidl issdl sisdl sdsil dssil ssdil ssdil dssil sdsil idssl dissl isdsl sidsl dsisl sdisl sldsi lsdsi sdlsi dslsi ldssi dlssi slsdi lssdi ssldi ssldi lssdi slsdi sdsli dssli ssdli ssdli dssli sdsli ldssi dlssi lsdsi sldsi dslsi sdlsi ildss lidss idlss dilss ldiss dliss ilsds lisds islds silds lsids slids idsls disls isdls sidls dsils sdils ldsis dlsis lsdis sldis dslis sdlis
Note: these 'words' (valid or invalid) are all the permutations of the word silds. These words are obtained by scrambling the letters in silds.