cyph ycph cpyh pcyh ypch pych cyhp ychp chyp hcyp yhcp hycp cphy pchy chpy hcpy phcy hpcy yphc pyhc yhpc hypc phyc hpyc
Note: these 'words' (valid or invalid) are all the permutations of the word cyph. These words are obtained by scrambling the letters in cyph.