规则Rules：
标准数独基础上，提示⑤表示其周围数字之和为5，提示⑥表示其周围数字之和为6。所有和是5或6的情况都被标记了。
Classic rules applied. Additionally, 5 is marked between two digits in adjacent cells with the sum of 5, and 6 likewise. All the adjacent pairs that have a sum of 5 or 6 are marked.
◆例题 Example
◆在线做 Do it by CTC
◆在线做 Do it by Penpa
