serrs esrrs srers rsers ersrs resrs serrs esrrs srers rsers ersrs resrs srres rsres srres rsres rrses rrses errss rerss errss rerss rress rress sersr esrsr sresr rsesr erssr ressr sesrr essrr sserr sserr essrr sesrr srser rsser ssrer ssrer rsser srser erssr ressr esrsr sersr rsesr sresr sersr esrsr sresr rsesr erssr ressr sesrr essrr sserr sserr essrr sesrr srser rsser ssrer ssrer rsser srser erssr ressr esrsr sersr rsesr sresr srrse rsrse srrse rsrse rrsse rrsse srsre rssre ssrre ssrre rssre srsre srsre rssre ssrre ssrre rssre srsre rrsse rrsse rsrse srrse rsrse srrse errss rerss errss rerss rress rress ersrs resrs esrrs serrs rsers srers ersrs resrs esrrs serrs rsers srers rrses rrses rsres srres rsres srres
Note: these 'words' (valid or invalid) are all the permutations of the word serrs. These words are obtained by scrambling the letters in serrs.