When the bottom half of a square sheet is lifted onto the top half and punched with two triangles, one pointing left and one pointing up, what does the opened sheet look like?

Question

Accepted Answer

(a). A top-bottom mirror leaves a left-pointing triangle pointing left but turns an upward triangle into a downward one. So the twins in the bottom half are a left-pointing and a down-pointing triangle: (a).

When the bottom half of a square sheet is lifted onto the top half and punched with two triangles, one pointing left and one pointing up, what does the opened sheet look like?

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