"First I designed the shape. Then I saw that the four arms of the cross and the middle square have areas which are multiples of 7. So I tried to fill them separately. I succeeded in filling the four arms, and before I got to fill the square, I realized that it can be further divided into four 8x7 rectangles. For this task I used the computer, and finally it spit out the attached solution. In how many ways can the parts be rearranged? :-)"
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