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We would like to thank all the staff at Express Publishing who have contributed their skills to producing
this book. Thanks for their support and patience are due in particular to: Mary Palmer (Editor in Chief);
Sean Todd (senior editor); Steve Miller (editorial assistant); Richard White (senior production controller);
the Express design team; Sweetspot (recording producers). We would also like to thank those institutions
and teachers who piloted the manuscript, and whose comments and feedback were invaluable in the
production of the book.