CS 111
Lab 7, Task 1
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3) It makes the sense that the partial circuit outputs a 1 when both 
   inputs are 0 because the corresponding row of the truth table 
   (the first row) has an output of 1.

4) The original circuit is missing a subcircuit for the last row 
   of the truth table (x == 1, y == 1). 

5) We can include that row in the circuit by adding an AND subcircuit
   with inputs of x and y, and then connecting the output of 
   that AND gate to the existing OR gate.