wych ywch wcyh cwyh ycwh cywh wyhc ywhc whyc hwyc yhwc hywc wchy cwhy whcy hwcy chwy hcwy ychw cyhw yhcw hycw chyw hcyw
Note: these 'words' (valid or invalid) are all the permutations of the word wych. These words are obtained by scrambling the letters in wych.