Select the letter-cluster from among the given option that can replace the question mark (?) in the following series.
JQMN, NMQJ, ? , VEYB, ZACX
J + 4 = N; N + 4 = R; R + 4= V; V + 4 = Z Q -4 = M; M - 4 = I; I - 4 = E; E - 4 = A M +4 = Q; Q + 4 = U; U + 4 = Y; Y + 4 = C N -4 = J; J - 4 = F; F - 4 = B; B - 4 = X So, the next term of the series after NMQJ is RIUF.
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