Parted Square Puzzle

The Puzzle:

Parted Square

You have six squares (divided into 6x6 smaller squares).

Each has a different pattern of holes.

Which three of them can form an opaque (non-transparent) square when stacked on top of each other?

You are allowed to rotate or flip the squares.

Author: Peter Grabarchuk
This Puzzle © 2007 Peter Grabarchuk. All Rights Reserved.
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