vdoh dvoh vodh ovdh dovh odvh vdho dvho vhdo hvdo dhvo hdvo vohd ovhd vhod hvod ohvd hovd dohv odhv dhov hdov ohdv hodv
Note: these 'words' (valid or invalid) are all the permutations of the word vdoh. These words are obtained by scrambling the letters in vdoh.