A | B
--|--
0 | 1
1 | 0

A B | C
----|--
0 0 | 0
0 1 | 0
1 0 | 0
1 1 | 1

A B | C
----|--
0 0 | 1
0 1 | 1
1 0 | 1
1 1 | 0

A B | C
----|--
0 0 | 0
0 1 | 1
1 0 | 1
1 1 | 1

A B | C
----|--
0 0 | 1
0 1 | 0
1 0 | 0
1 1 | 0

A B | C
----|--
0 0 | 0
0 1 | 1
1 0 | 1
1 1 | 0

A B | C
----|--
0 0 | 1
0 1 | 0
1 0 | 0
1 1 | 1