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When you go shopping for your next phone , get one that you can install software on . Hell , get one of each and call it a buffet . The reason postfix is sometimes useful is that there is a natural way to evaluate a postfix expression using a stack : Starting at the beginning of the expression , get one term ( operator or operand ) at a time . If you ca n't find a tutorial , get one of the older " how to " instructional books such as Stained Glass Primer by Mollica . While we ’ re on that , if you ’ re against stem cell research , then go to a lab , get one , implant it in your wife or yourself , bring it to term and raise it .