Question: Explain how the k-clique problem (i.e., the decision problem that asks whether there exists a complete subgraph that consists of k nodes in an undirected

Explain how the k-clique problem (i.e., the decision problem that asks whether there exists a complete subgraph that consists of k nodes in an undirected graph G, where k is a positive integer that is greater than or equal to 2) can be expressed as an existential second order formula.

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