You put one square diagonally and one small square in the center of the diagonal one.
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Take two equally sized squares on top of each other, rotate one of them 45degrees to the other. You then get 8 triangles around an octagon in the center.
please tell me
It means nine squares in tic tac toe
you cant.
Make an hexahedron in the form of a triangular dipyramid. See link for images.