What should come in place of '?' in the given series based on the English alphabetical order? URW GDI SPU EBG ?
QNS
Within each cluster, the second letter is 3 places before the first letter, and the third letter is 2 places after the first letter: URW (U-3=R, U+2=W), GDI (G-3=D, G+2=I), SPU (S-3=P, S+2=U), EBG (E-3=B, E+2=G).
Now looking at the first letters of the clusters: U, G, S, E follow an alternating pattern of -14 then +12: U to G is -14, G to S is +12, S to E is -14, so the next step is +12.
\(E + 12 = Q\).
Applying the internal pattern to Q: \(Q - 3 = N\) and \(Q + 2 = S\).
Hence, the missing cluster is QNS.
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