wich iwch wcih cwih icwh ciwh wihc iwhc whic hwic ihwc hiwc wchi cwhi whci hwci chwi hcwi ichw cihw ihcw hicw chiw hciw
Note: these 'words' (valid or invalid) are all the permutations of the word wich. These words are obtained by scrambling the letters in wich.