nrqe rnqe nqre qnre rqne qrne nreq rneq nerq enrq renq ernq nqer qner neqr enqr qenr eqnr rqen qren reqn erqn qern eqrn
Note: these 'words' (valid or invalid) are all the permutations of the word nrqe. These words are obtained by scrambling the letters in nrqe.