// 当前元素入栈：成为「左侧元素」的候选更大值（易错点4：别漏写这一步）
Москвичей предупредили о резком похолодании09:45
，更多细节参见51吃瓜
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Equal (5): Everything in this purple space must be equal to 5. The answer is 5-5, placed horizontally; 5-6, placed vertically.