provE this can bE truE!

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As you can see, there are 2 triangles in the above arrangement. The 2 triangles contain 4 differrent shapes in 4 different colors in which all the 4 color shapes of each triangle are all the same in sizes. The 2 triangles are 13 X 5 squares. We rearranged those 4 shapes as shown in the second triangle, but it looks like one square is not covered! Prove how can this be true!

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Answer: to be later updated

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