[A] + [E1] -> [AE1]; k1
[AE1] -> [A] + [E1]; k2
[AE1] -> [Ap] + [E1]; k3
[Ap] + [E1] -> [ApE1]; k4
[ApE1] -> [Ap] + [E1]; k5
[ApE1] -> [App] + [E1]; k6
[App] + [E2] -> [AppE2]; k7
[AppE2] -> [App] + [E2]; k8
[AppE2] -> [Ap] + [E2]; k9
[Ap] + [E2] -> [ApE2]; k10
[ApE2] -> [Ap] + [E2]; k11
[ApE2] -> [A] + [E2]; k12
