Problem number four. Four identical pieces of paper are placed as shown. Michael wants to punch a hole that goes through all four pieces. At which point should Michael punch the hole? A, B, C, D, or E? I am going to outline all four pieces of paper. So, C goes through three pieces, D goes through four pieces, E goes through three pieces, E goes through two pieces, and A goes through three pieces. So our answer is D.

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