6. Cut a square with a side of 4 into rectangles, the sum of the perimeters of which is 25.
For example, two rectangles $2 \times 0.5$ and one rectangle $3.5 \times 4-$ cm. The total perimeter is $2 * 2 * (2 + 0.5) + 2 * (3.5 + 4) = 25$.

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