kctv cktv ktcv tkcv ctkv tckv kcvt ckvt kvct vkct cvkt vckt ktvc tkvc kvtc vktc tvkc vtkc ctvk tcvk cvtk vctk tvck vtck
Note: these 'words' (valid or invalid) are all the permutations of the word kctv. These words are obtained by scrambling the letters in kctv.