This image is almost a wholesale copy of the illustration used on page 98 of "Design Patterns." The layout is an exact copy, the names of the classes and methods are exactly the same. Is it OK for Wikimedia, if this image is a nearly exact reproduction?
- Gamma, Erich (1995). Design Patterns: Elements of Reusable Object-Oriented Software. Addison-Wesley. ISBN 0-201-63361-2.
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