foxl ofxl fxol xfol oxfl xofl folx oflx flox lfox olfx lofx fxlo xflo flxo lfxo xlfo lxfo oxlf xolf olxf loxf xlof lxof
Note: these 'words' (valid or invalid) are all the permutations of the word foxl. These words are obtained by scrambling the letters in foxl.