Rules: Draw a single non-intersecting loop vertically or horizontally through some cells. The loop must visit each bold outlined region once. In every second region visited along the path of the loop, the loop uses an even number of cells, while in every other region, it uses an odd number of cells. Letters 'O' and 'E', if given, indicate that the loop uses an odd/even number of cells in that region.
About: Euler's Expedition was invented by Anurag Sahay in 2021.
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