Choose the missing terms out of the given alternatives Z, S, W, O, T, K, Q, G, ?, ?

The given sequence a combination of two series:
I)Z, W, T, Q, ?      and      II)S, O, K, G, ?

The pattern I is
Z - 3 = W
W - 3 = T
T - 3 = Q
Q - 3 = N

The pattern in II is
S - 4 = O
O - 4 = K
K - 4 = G
G - 4 = C