yxml xyml ymxl myxl xmyl mxyl yxlm xylm ylxm lyxm xlym lxym ymlx mylx ylmx lymx mlyx lmyx xmly mxly xlmy lxmy mlxy lmxy
Note: these 'words' (valid or invalid) are all the permutations of the word yxml. These words are obtained by scrambling the letters in yxml.