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Loop (Portals) (936)
Instruction:
Draw a single closed loop (without intersections or crossings) through the centers of all cells. Loop paths must be orthogonal.
Some cells are marked with oval-shaped portals; each portal will either be "inactive" (no number inside it) or "paired" (having a number that matches that on another portal). When the loop goes into a cell with an inactive portal, it must continue straight through that cell; when the loop goes into a cell with a paired portal, it disappears into that portal and comes out of that portal’s pair, in the same direction.