A
B
C
D
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
1
1
0
0
0
1
0
1
1
1
1
0
1
1
1
1
1
Docs doesn't have the syntax so lowercase is a NOT letter
aBC
AbC
ABc
ABC
D = aBC+AbC+ABc+ABC
D = aBC+AbC+AB