resew ersew rseew sreew esrew serew reesw eresw reesw eresw eersw eersw rseew sreew resew ersew serew esrew eserw seerw eesrw eesrw seerw eserw reswe erswe rsewe srewe esrwe serwe rewse erwse rwese wrese ewrse werse rswee srwee rwsee wrsee swree wsree eswre sewre ewsre wesre swere wsere reews erews reews erews eerws eerws rewes erwes rwees wrees ewres weres rewes erwes rwees wrees ewres weres eewrs eewrs ewers weers ewers weers rsewe srewe reswe erswe serwe esrwe rswee srwee rwsee wrsee swree wsree rewse erwse rwese wrese ewrse werse sewre eswre swere wsere ewsre wesre esewr seewr eeswr eeswr seewr esewr eswer sewer ewser weser sweer wseer eewsr eewsr ewesr weesr ewesr weesr sewer eswer sweer wseer ewser weser
Note: these 'words' (valid or invalid) are all the permutations of the word resew. These words are obtained by scrambling the letters in resew.