Select the letter cluster from among the given options that can replace the question mark (?) in the following series.
ORU, SVY, WZC, ?, EHK
O + 4 = S; S + 4 = W; W + 4 = A; A + 4 = E R + 4 = V; V + 4 = Z; Z + 4 = D; D + 4 = H U + 4 = Y; Y + 4 = C; C + 4 = G; G + 4 = K
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