63. After an expression has been properly plotted on a Veitch

diagram, a simplified expression is easily extracted.

Learn to

describe the plotted squares with as few terms as possible.

First, look for patterns of four plotted squares which describe a

one-variable term, as follows:

As indicated by the diagrams above, when the four plotted squares

cover all the squares assigned to one variable, the plot can be

represented by that one variable.

The expression ABC+ABC+AB is

plotted as follows:

It is evident that the four plotted squares include all the

squares assigned to A.

Therefore, the expression ABC+ABC+AB can

be simplified by extracting the term which is common to these

four squares--in this case, A.

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