Here's an ironic twist from my days in college: CompScis had to take a version of Numerical Analysis which had no programming. MEs has to take a version of Numerical Analysis that was all programming.
So if you push out the bottom package from the bottom of a stack of packages, all the rest of the packagesin the stack are going to fall on top of your pushing device.
I think the idea is to learn how to do it the other way...
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