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the hourglass you bolded out is 1 + 1 + 9 + 2 = 13 you do not add the two outer 1's in the middle line with the three 1's above the line with 9
2D Array - DS
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the hourglass you bolded out is 1 + 1 + 9 + 2 = 13 you do not add the two outer 1's in the middle line with the three 1's above the line with 9