12 col grid

3 x 3 x 3 x 3 col grid

4 x 4 x 4 col grid

6 x 6 col grid

7 x 5 col grid

9 x 3 col grid

5 x 7 col grid

3 x 9 col grid

10 x 2 col grid

2 x 10 col grid

8 x 4 col grid