kcpp ckpp kpcp pkcp cpkp pckp kcpp ckpp kpcp pkcp cpkp pckp kppc pkpc kppc pkpc ppkc ppkc cppk pcpk cppk pcpk ppck ppck
Note: these 'words' (valid or invalid) are all the permutations of the word kcpp. These words are obtained by scrambling the letters in kcpp.