Given the following 15-by-15 matrix of numbers, find a 2-by-2 subset matrix whose sum is the smallest. Please provide your answer in the form of [row_start row_end column_start column_end]. For example, if your answer is the higlighted region in the figure, then you will present it as [13 14 3 4].
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Last Solution submitted on Sep 25, 2026

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