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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
Thank you. I feel really stupid reading my comment now. I must not have actually added the numbers manually.
Thanks for the question, though. I was running into the same issue, and then after reading, was like, 'duh!'