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君子战虽有陈，而勇为本焉；丧虽有礼，而哀为本焉；士虽有学，而行为本焉。

Given an array of `intervals` where `intervals[i] = [starti, endi]`, merge all overlapping intervals, and return an array of the non-overlapping intervals that cover all the intervals in the input.

墙角数枝梅，凌寒独自开。

RubyGems is a package manager for the Ruby programming language that provides a standard format for distributing Ruby programs and libraries (in a self-contained format called a "gem"), a tool designed to easily manage the installation of gems, and a server for distributing them.

登临送目，正故国晚秋，天气初肃。

爆竹声中一岁除，春风送暖入屠苏。

敕勒川，阴山下。