Upper three blocks are identical to the lower three blocks including each character positions.
ab cd e fg h i jkl mn o q rs t uv
ab cd e fg h i jkl mn o q rs t uv
ab cd e fg h i jkl mn o q rs t uv
ab cd e fg h i jkl mn o q rs t uv
h s d l r cgk v fj qu b n aeimot
ab cd e fg h i jkl mn o q rs t uv