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