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© Copyright Craig Barton 2007-16. All rights reserved.

This site may be accessed by anyone.

The contents may be viewed online or downloaded for personal use. The may also be shared or modified to suit individual needs, but each time credit must be given to Mr Barton Maths and a link placed back to this website.

They may not be distributed for a fee. They may not be incorporated into other sites or publications without the prior agreement of the author.