kdyn dkyn kydn ykdn dykn ydkn kdny dkny kndy nkdy dnky ndky kynd yknd knyd nkyd ynkd nykd dynk ydnk dnyk ndyk yndk nydk
Note: these 'words' (valid or invalid) are all the permutations of the word kdyn. These words are obtained by scrambling the letters in kdyn.