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This library gives you a glimpse of what SICStus Prolog can do. The API is intentionally mostly compatible with that of SICStus Prolog, so that you can easily switch to a much more feature-rich and much faster CLP(FD) system when you need it. I thank Mats Carlsson, the designer and main implementor of SICStus Prolog, for his elegant example. I first encountered his system as part of the excellent GUPU teaching environment by Ulrich Neumerkel. Ulrich was also the first and most determined tester of the present system, filing hundreds of comments and suggestions for improvement. Tom Schrijvers has contributed several constraint libraries to SWI-Prolog, and I learned a lot from his coding style and implementation examples. Bart Demoen was a driving force behind the implementation of attributed variables in SWI-Prolog, and this library could not even have started without his prior work and contributions. Thank you all!