规则Rules：
标准数独基础上，如果有标记的格内为A，则标记所指的方向上，距离标记格为A的两格数字相同。
Classic rules applied. Additionally, lines in a cell mark that in those directions both digits are the same at a distance of A, with A as the value of that cell.
◆在线做 Do it by CTC
◆在线做 Do it by Penpa
