Select the letter cluster from among the given options that can replace the question mark (?) in the following series.
CHK, EFM, GDO, ?, KZS
C + 2 = E; E + 2 = G; G + 2 = I; I + 2 = K H – 2 = F; F – 2 = D; D – 2 = B; B – 2 = Z K + 2 = M; M + 2 = O; O + 2 = Q; Q + 2 = S
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