Lab 3: The Basic Parts
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In this lab, you will add the first classes in this project. Specifically, we
will create the Pin, Wire, and generic Component classes. Each will be set up
with tests to check that they function properly. Once those all work, we will
build our first real digital part: the lowly inverter. We will also use three
inverters to make a simple circuit that does something useful.

What to do
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For this lab, you need to work through the code in the lecture notes. This lab
consists of steps 4-7 in those notes.

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