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We looked at different rectangles and tried to make up a set for the grid with the 1x5 rectangle in the middle. On the top left hand side a 2x2 or a 1x3 rectangle both fit. We can't find a solution for the middle top row. On the top right hand side we got 2x3. On the left hand side of the middle row is 2x4. On the right hand side on the middle row is a 3x3. On the bottom row on the left hand side and the middle we can't find an answer. On the bottom right hand side is a 6x6 rectangle.