Tamanda, a 3-footed monster, required 3 sizes of boots. All of his many pairs were all jumbled together in the closet,and it was too dark in there for anyone to see. Tamanda had 6 pairs of size-20 boots, 7 pairs of size-21 boots, and 8 pairs of size-22 boots.

How many boots would Tamanda have to pull out of the closet to make sure he had one size-20 boot, one size-21 boot, and one size-22 boot?

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