dirls idrls drils rdils irdls ridls dilrs idlrs dlirs ldirs ildrs lidrs drlis rdlis dlris ldris rldis lrdis irlds rilds ilrds lirds rlids lrids dirsl idrsl drisl rdisl irdsl ridsl disrl idsrl dsirl sdirl isdrl sidrl drsil rdsil dsril sdril rsdil srdil irsdl risdl isrdl sirdl rsidl sridl dilsr idlsr dlisr ldisr ildsr lidsr dislr idslr dsilr sdilr isdlr sidlr dlsir ldsir dslir sdlir lsdir sldir ilsdr lisdr isldr sildr lsidr slidr drlsi rdlsi dlrsi ldrsi rldsi lrdsi drsli rdsli dsrli sdrli rsdli srdli dlsri ldsri dslri sdlri lsdri sldri rlsdi lrsdi rsldi srldi lsrdi slrdi irlsd rilsd ilrsd lirsd rlisd lrisd irsld risld isrld sirld rsild srild ilsrd lisrd islrd silrd lsird slird rlsid lrsid rslid srlid lsrid slrid
Note: these 'words' (valid or invalid) are all the permutations of the word dirls. These words are obtained by scrambling the letters in dirls.