bdex dbex bedx ebdx debx edbx bdxe dbxe bxde xbde dxbe xdbe bexd ebxd bxed xbed exbd xebd dexb edxb dxeb xdeb exdb xedb
Note: these 'words' (valid or invalid) are all the permutations of the word bdex. These words are obtained by scrambling the letters in bdex.