plex lpex pelx eplx lepx elpx plxe lpxe pxle xple lxpe xlpe pexl epxl pxel xpel expl xepl lexp elxp lxep xlep exlp xelp
Note: these 'words' (valid or invalid) are all the permutations of the word plex. These words are obtained by scrambling the letters in plex.