This booklet has been produced in a way which will help you learn the facts contained within it. From time to time as you work through it, you will be asked to answer questions to make sure you have understood the material you have read. Answer the questions and then check your answer with that on the next page, or by looking back if instructed to do so. Do not merely write in the answer by copying material from an earlier page, as you will not learn so much this way.
The short test at the end of the booklet will enable you to measure how much you have absorbed, and point out the need for re-reading certain sections if necessary.
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