_Test_4a
0 -   (1 = )
1 -  (1 = )
1 -  (1 = )
4 -  
A=0 B=0 C=0 D=0 
A -> C= 1
B -> D= 2 
C -> A= 1 D= 10 
D -> C= 10 B= 1 

