3
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Not sure where my friend got it from, but here is it.

enter image description here

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1 Answer 1

6
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The answer is, I believe,

the single dot.

enter image description here

Here's my logic:

On each line, the third shape is obtained by applying "AND" logic on horizontal/vertical lines of the two first shapes, and "XOR" logic on diagonal lines of the two first shapes.

enter image description here

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    $\begingroup$ rot13(Guvf qrfpevcgvba npghnyyl nccyvrf gb gur pbyhzaf nf jryy nf gb gur ebjf.) $\endgroup$ Commented Jun 12 at 23:17

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