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Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
UY, ZD, EI, JN, ?
UY ==> (U+5) (Y+5) ==> ZD
ZD ==> (Z+5) (D+5) ==> EI
EI ==> (E+5) (I+5) ==> JN
JN ==> (J+5) (N+5) ==> OS
Hence 'OS' will come in place of the question mark.
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