ruler urler rluer lruer ulrer lurer ruelr urelr reulr erulr uerlr eurlr rleur lreur relur erlur lerur elrur ulerr luerr uelrr eulrr leurr elurr rulre urlre rlure lrure ulrre lurre rurle urrle rrule rrule urrle rurle rlrue lrrue rrlue rrlue lrrue rlrue ulrre lurre urlre rulre lrure rlure ruerl urerl reurl erurl uerrl eurrl rurel urrel rruel rruel urrel rurel rerul errul rreul rreul errul rerul uerrl eurrl urerl ruerl erurl reurl rleru lreru relru erlru lerru elrru rlreu lrreu rrleu rrleu lrreu rlreu rerlu errlu rrelu rrelu errlu rerlu lerru elrru lreru rleru erlru relru ulerr luerr uelrr eulrr leurr elurr ulrer lurer urler ruler lruer rluer uerlr eurlr urelr ruelr erulr reulr lerur elrur lreur rleur erlur relur
Note: these 'words' (valid or invalid) are all the permutations of the word ruler. These words are obtained by scrambling the letters in ruler.