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