Parted Circle Puzzle

The Puzzle:

Parted Circle

You have nine circles (divided into 16 smaller sectors). Each has a different pattern of holes. Which two of them can form an opaque (non-transparent) circle when stacked on top of each other?

Circles can be rotated and/or overturned.

Author: Peter Grabarchuk
This Puzzle © 2008 Peter Grabarchuk. All Rights Reserved.
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