In a k-coloring of a uniquely k-colorable graph, the subgraph induced by the union of any two color classes is connected.
貌似是说，从一个图中选取标有同类颜色
节点，
些节点构成子图是
。是样
？
In a k-coloring of a uniquely k-colorable graph, the subgraph induced by the union of any two color classes is connected.
貌似是说，从一个图中选取标有同类颜色节点，些节点构成子图是。是样？
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