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As in linear programming, our rst step is to decide on our variables. This can be much more di cult in integer programming because there are very clever ways to use integrality restrictions. In this case, we will use a 0-1 variable x j for each investment. If x j is 1 then we will make investment j.If it is 0, we will not make the investment.

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in 4.1 made possible by the joint work on natbib 8.3. Multiple BibTEX entries can be combined into a single \bibitem command. Free form text can be prepended and ap-pended to a bibliographic entry using the spe-cial starred (*) argument to the \cite com-mand. Often a citation in the bibliography will have

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Portions Copyright © 2003, 2006, 2009 and 2012 Intern ational Code Council. All rights reserved. 191 CHAPTER 9 FIRE PROTECTION SYSTEMS SECTION FC 901