xdol dxol xodl oxdl doxl odxl xdlo dxlo xldo lxdo dlxo ldxo xold oxld xlod lxod olxd loxd dolx odlx dlox ldox oldx lodx
Note: these 'words' (valid or invalid) are all the permutations of the word xdol. These words are obtained by scrambling the letters in xdol.