wibb iwbb wbib bwib ibwb biwb wibb iwbb wbib bwib ibwb biwb wbbi bwbi wbbi bwbi bbwi bbwi ibbw bibw ibbw bibw bbiw bbiw
Note: these 'words' (valid or invalid) are all the permutations of the word wibb. These words are obtained by scrambling the letters in wibb.