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缺月挂疏桐，漏断人初静。

元丰六年十月十二日夜，解衣欲睡，月色入户，欣然起行。

Given an `m x n` matrix `board` containing `'X'` and `'O'`, capture all regions that are 4-directionally surrounded by 'X'.

似花还似非花，也无人惜从教坠。

游蕲水清泉寺，寺临兰溪，溪水西流。

水光潋滟晴方好，山色空蒙雨亦奇。

老夫聊发少年狂，左牵黄，右擎苍，锦帽貂裘，千骑卷平冈。

Given an unsorted array of integers `nums`, return the length of the longest consecutive elements sequence.

花褪残红青杏小，燕子飞时，绿水人家绕。