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The Books are divided into four parts. Each part is divided into short self-contained units, each of which develops a set of well-defined themes or concepts. Students may work through the units in order, or individual units may be used separately. Each unit is divided into sections, with short questions at the end of each section which may be used by students as a means of self-assessment. More extensive questions on the different sections are given at the end of the book. These may be used to provide material for student assignments, and to provide students with practice in answering examination questions.