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Step 1: Fold in half the short way, then fold in half the other way, so the paper is folded in quarters.
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Step 2: Unfold once and then fold the two corners of the folded edge in toward the middle so they meet at the center crease.
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Step 3: Unfold the whole paper and lay out so there is a peak in the middle.
|  | Push the folds on the two longer sides in toward the middle, so they are folded inward. You should have a triangular shape.
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Step 4: Fold the sides in so they meet at the middle crease. Turn over and repeat on the other side.
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Step 5: Fold the lower edge up to meet the horizontal edges of the flaps above it.
|  | Fold over again and crease firmly. Turn over and repeat this on the other side.
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Step 6: Fold down the peak to meet the bottom edge, then unfold. This crease is just to define the bottom edges of the tray.
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Step 7: Grasp the side flaps and pull in opposite directions to open.
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