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Find and mark all the 20s.

Find and mark all the 19s.

Find and mark all the 18s.

Find and mark all the 17s.

Find and mark all the 16s.

Find and mark all the 15s.

Find and mark all the 14s.

Find and mark all the 13s.

Find and mark all the 12s.

Find and mark all the 11s.