A square piece of paper is folded in half (bringing the top edge to the bottom edge), then in half again (left edge to right edge). A small triangle is cut from the single closed corner (all folds meet here). When unfolded, the cutout forms a:
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A
Diamond (rhombus) shape at the center
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B
Triangle at one corner
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C
Four small triangles at the four corners
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D
Square in the center