Question: Show that this problem below is NP-hard: (is it by reduction from independent set, vertex cover, or something else? I do not know.) Minimum Set

Show that this problem below is NP-hard: (is it by reduction from independent set, vertex cover, or something else? I do not know.)

Minimum Set Cover: Given n elements E = {e₁,...,e_n} and m subsets of E, S_i E, and integer k, determine if there is some k of the sets {S_i} such that their union is E.

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