0 -> S_d
R_d -> S_d
E_d -> S_d
S_d -> E_d
S_d -> 0
E_d -> I_d
E_d -> 0
I_d -> 0
S_d -> R_d
E_d -> R_d
I_d -> 0
R_d -> 0
0 -> S_h
R_h -> S_h
E_h -> S_h
S_h -> 0
S_h -> E_h
E_h -> I_h
E_h -> 0
E_h -> R_h
I_h -> 0
I_h -> 0
R_h -> 0