English: When the degree is less than or equal to 2 or the diameter is less than or equal to 1, the problem becomes trivial, solved by the cycle graph and complete graph respectively.
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Captions
When the [[degree (graph theory)|degree]] is less than or equal to 2 or the [[Diameter (graph theory)|diameter]] is less than or equal to 1, the problem becomes trivial, solved by the [[cycle graph]] and [[complete graph]] respectively.