//example 3.2

clc;
clear;
disp("Multipl the factors of the foregoing equation to get");
disp('Y = A''A + A''B + BA +BB');
disp('it becomes,    Y =  A''B + AB + B ');
disp('We can factor the foregooing equation as follows :');
disp('Y =  B(A'' + A) + B = B + B = B ');
disp('this says that output Y equals to B, so all we have to do is connect a wire between input B and output Y.');