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Is the following Knapsack Variant NP-Hard?
The problem: Let $A_1 = \{a^1_1,\ldots,a^1_n\}, A_2 = \{a^2_1,\ldots,a^2_n\}, \ldots, A_k = \{a^k_1,\ldots,a^k_n\} \subset \mathbb{N}$ be $k$ sets of $n$ integers, and let $U,L \in \mathbb{N}$ be ...
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