D1 D2 D3 D4 target
B  D  D  A  1
C  B  C  A  0
B  B  C  B  0
B  D  C  A  1
B  D  D  A  1
C  D  B  B  0
B  B  D  C  1
B  D  B  A  1
C  B  B  B  0
C  B  D  B  0
C  B  D  C  0
B  D  D  C  1
C  B  B  C  0
C  B  D  C  0
B  D  D  A  1
B  B  D  A  1
