0 -> T1
0 -> T1
0 -> T1
T1 -> 0
0 -> T2
0 -> T2
0 -> T2
T2 -> 0
0 -> T3
0 -> T3
0 -> T3
T3 -> 0
0 -> C1
C1 -> 0
0 -> C2
C2 -> 0
0 -> C3
C3 -> 0