byrl ybrl bryl rbyl yrbl rybl bylr yblr blyr lbyr ylbr lybr brly rbly blry lbry rlby lrby yrlb rylb ylrb lyrb rlyb lryb
Note: these 'words' (valid or invalid) are all the permutations of the word byrl. These words are obtained by scrambling the letters in byrl.