nngf nngf ngnf gnnf ngnf gnnf nnfg nnfg nfng fnng nfng fnng ngfn gnfn nfgn fngn gfnn fgnn ngfn gnfn nfgn fngn gfnn fgnn
Note: these 'words' (valid or invalid) are all the permutations of the word nngf. These words are obtained by scrambling the letters in nngf.