rouen oruen ruoen uroen ouren uoren roeun oreun reoun eroun oerun eorun rueon ureon reuon eruon ueron euron ouern uoern oeurn eourn ueorn euorn roune orune ruone urone ourne uorne ronue ornue rnoue nroue onrue norue runoe urnoe rnuoe nruoe unroe nuroe ounre uonre onure noure unore nuore roenu orenu reonu eronu oernu eornu roneu orneu rnoeu nroeu onreu noreu renou ernou rneou nreou enrou nerou oenru eonru oneru noeru enoru neoru rueno ureno reuno eruno uerno eurno runeo urneo rnueo nrueo unreo nureo renuo ernuo rneuo nreuo enruo neruo uenro eunro unero nuero enuro neuro ouenr uoenr oeunr eounr ueonr euonr ouner uoner onuer nouer unoer nuoer oenur eonur oneur noeur enour neour uenor eunor uneor nueor enuor neuor
Note: these 'words' (valid or invalid) are all the permutations of the word rouen. These words are obtained by scrambling the letters in rouen.