xury uxry xruy rxuy urxy ruxy xuyr uxyr xyur yxur uyxr yuxr xryu rxyu xyru yxru ryxu yrxu uryx ruyx uyrx yurx ryux yrux
Note: these 'words' (valid or invalid) are all the permutations of the word xury. These words are obtained by scrambling the letters in xury.