fenz efnz fnez nfez enfz nefz fezn efzn fzen zfen ezfn zefn fnze nfze fzne zfne nzfe znfe enzf nezf eznf zenf nzef znef
Note: these 'words' (valid or invalid) are all the permutations of the word fenz. These words are obtained by scrambling the letters in fenz.