Question: the 3 - TSP problem takes an undirected graph G = ( V , E ) with positive edge weights as well as a positive

the 3-TSP problem takes an undirected graph G =(V, E) with
positive edge weights as well as a positive integer k as input, and asks whether there are three
closed tours in G such that all three tours together visit every vertex in V exactly once, and the
total sum of all edge weights on both tours is at most k. Prove that 3-TSP is NP-complete

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