A B C D->Z
0 0 0 0 Z=0 
1 0 0 0 Z=0 
1 1 0 0 Z=0 
0 1 0 0 Z=0 
0 1 1 0 Z=0 
1 1 1 0 Z=0 
1 0 1 0 Z=0 
0 0 1 0 Z=0 
0 0 1 1 Z=0 
1 0 1 1 Z=0 
1 1 1 1 Z=1 
0 1 1 1 Z=0 
0 1 0 1 Z=0 
1 1 0 1 Z=0 
1 0 0 1 Z=0 
0 0 0 1 Z=0 
function: Z = (A && B && C && D)