This is a 2D Printing puzzle, a new interesting type that debuted recently.
Rules: Draw a single, non-intersecting loop, vertically or horizontally through the centres of the cells. The path of the loop has to pass each of the edges marked with a circle. Furthermore, the portions of the loop on either side of the given circle, extending as far as before leaving the region, should both be absolutely identical in shape and length, including the directions of turns (ignoring rotations and reflections).
About: “2D Printing” was invented by Anurag Sahay.
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