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A lies on its back with its shorter arm on the right, pointing upwards. B sits on top of A's longer arm as illustrated right. C lies flat, shorter arm towards you on the right. D slots in alongside, high bit on the right resting on top of C's shorter arm. Move these two two-part sections alongside one another so that the long arm of C is in the middle and the short upward pointing arm of A is on the right. (If all has gone well, the base will now be a square.)
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