规则Rules：
标准数独基础上，提示表示了框内数字之和的奇偶性。
Classic rules applied. Additionally, O and E clues show the parity of the sum of numbers in cages.
◆例题Example
◆在线涂鸦 Draw it Online
◆在线做 Do it by CTC
◆在线做 Do it by Penpa
