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    That's 20 1's and 10 2's. 20 + 20 = 40 total.

    We increase to size 2 after eating 4, so there's 36 left

    We increase to size 3 after eating 8 more, so there's 28 left

    We increase to size 4 after eating 12 more, so there's 16 left

    We increase to size 5 after eating 16 more, with 0 left