Control-NOT
A B C
0 0 0
0 1 1
1 0 1
1 1 0
Contr-Contr-NOT (Tuffoli)
A B C D
0 0 0 0
0 0 1 1
0 1 0 0
0 1 1 1
1 0 0 0
1 0 1 1
1 1 0 1
1 1 1 0