规则Rules：
标准数独基础上，每条线条上的数字之和等于两侧圆圈里的数字之和。
Classic rules applied. Additionally, the sum of numbers on each line, equals to the sum of the circles on the ends.
◆在线做 Do it by CTC
◆在线做 Do it by Penpa
⑨颗星，虽然通过对称性知道这题终盘是宇宙（答案高度对称）但是做不了一点
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