A matrix uses an 'XOR overlap' rule: where two shapes overlap, the overlapping region disappears. Row 1 shows two overlapping circles producing a result. Row 2 shows two overlapping squares producing a result. Row 3 shows two overlapping triangles. The missing piece should show:
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A
Two full triangles side by side
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B
A single triangle with its overlapping region removed
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C
A triangle with an extra region added
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D
A circle overlapping a triangle