规则Rules：
标准数独基础上，线条上的数字，其大小位于线两端圆圈内数字大小之间。
Classic rules applied. Additionally, the number on the line is between the size of the number inside the circle at both ends of the line.
◆例题Example
◆在线做Do it by CTC
◆在线做 Do it by Penpa
