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+//Example 3.21: Reduce expression using k-map with dont cares.
+clc; //clears the window
+clear; //clears all existing variables
+//Mapping the expression//
+disp(' W''X'' W''X WX WX'' ')
+disp('Y''Z'' X 1 1 ')
+disp('YZ'' X 1 1 ')
+disp('YZ X 1 1')
+disp('YZ'' X ')// the k-map is displayed.
+disp('g1 = x''z + w''yz + w''y''z'' + wxy''')
+disp('g2 = x''z + w''yz + xy''z'' + wxy''')
+disp('g3 = x''z + w''yz + xy''z'' + wy''z')