nonp onnp nnop nnop onnp nonp nopn onpn npon pnon opnn ponn nnpo nnpo npno pnno npno pnno onpn nopn opnn ponn npon pnon
Note: these 'words' (valid or invalid) are all the permutations of the word nonp. These words are obtained by scrambling the letters in nonp.