k1 = k0
k2 = k1
k3 = k2
k4 = k2_prime
k5 = k3
k6 = J3
k7 = k4
k8 = J4
k9 = k5
k10 = k6
k11 = Et
k12 = Km3
k13 = Km4
k14 = env
k15 = S