4 + 3 + 4 =, 11, 4, 6, 13, 3 + 1+ + 3 =, 15, 7, 13, 4, 2 + 2 + 4 =, 13, 8, 4, 7, 5+ 3 + 5 =, 10, 13, 7 + 2 +7 =, 16, 14, 6 + 1 + 6 =, 12, 13.

Adding 3 numbers using doubling

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