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Restricted waiver of copyright The printed material in this publication is subject to a restricted waiver of cop y right to allow the purchaser to make photocopies of the material con tained in the publication for use within a school, subject to the con di tions below. 1. All copies of the printed material shall be made without alteration or abridge ment and must retain acknowledgment of the copyright. 2. The school or college shall not sell, hire or otherwise derive income from copies of the material, nor distribute copies of the material for any other purpose. 3. The restricted waiver of copyright is not transferable and may be withdraw