Beauty of Circle

“Beauty of circle" is a boolean operation puzzle.
HOW TO PLAY?
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1. Choose one of animal pictures as the target image;
2. The target pattern is obtained by several circles through boolean operation. You need to observe and remember the outline information of the animal pattern;
3. In the answering region, a number of pictures with circles are distributed, and these pictures are randomly rotated by 90, 180 and 270 degrees;
4. You need to find the unique circle image, so that it can successfully match the target pattern through the boolean operation, you can challenge the success.
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