0 -> T
T -> I
R -> T
T -> R
I -> 0
I -> 0
0 -> F_1
F_1 -> 0
0 -> F_2
0 -> F_2
F_2 -> 0
0 -> N
0 -> N
0 -> E
0 -> E
I -> R
0 -> V
V -> 0
A + V -> 0
0 -> A
0 -> A