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Solution:
There are different ways to organize your thinking -- by row or by column. There are 4 rows with a sum of 1 + 3 + 6 + 10 = 20. Or 10 columns with a sum of 1 + 1 + 1 + 1 + 2 + 2 + 2 + 3 + 3 + 4 = 20.
20 bricks
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