0 -> N
N -> 0
N -> Na
Na -> 0
Na -> Nan
Nan -> Na
Nan -> 0
0 -> MF
MF -> 0
0 -> F
F -> 0
AK -> A + K
A + K -> AK
0 -> B
B -> 0
B -> Bp
Bp -> B
BN -> B
B -> BN
Bp -> 0
0 -> MAx
0 -> MAx
0 -> MAx
MAx -> 0
0 -> A
A -> 0
0 -> Rasa
Rasa -> 0
0 -> ERKa
ERKa -> 0
0 -> Xa
Xa -> 0
0 -> MDusp
MDusp -> 0
0 -> Dusp
Dusp -> 0