thkn htkn tkhn kthn hktn khtn thnk htnk tnhk nthk hntk nhtk tknh ktnh tnkh ntkh knth nkth hknt khnt hnkt nhkt knht nkht
Note: these 'words' (valid or invalid) are all the permutations of the word thkn. These words are obtained by scrambling the letters in thkn.