SWAP, Toffoli, Fredkin gates

Here, a,b, and c are integers between 0 and n.

1. SWAP gate:

   SW (a, b); or SW (a b);

2. Toffoli gate with the control bits a and b:

   Tf (a b, c);

3. Toffoli gate with the control bits b and c:

   Tf (a, b c);

4. Fredkin gate with the SWAPped bits b and c:

   Fr (a, b c);

5. Fredkin gate with the SWAPped bits a and b:

   Fr (a b, c);