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NeckerB NeckerW MullerLyer Steps cafewall Parallelogram illus-4 HermannDots Ouchi Trapezoids GhostlyGrid 1 3 color3 CirclesAroundCircles CornerCube 22 hg1 Poggendorf Stairs ImpossiBlock3 trident7 ConcaveParallels2 ConvexParallels squaress ConcaveSquare shimmer2 ImpossiBlock ConcaveParallels PerspectiveHeight

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