Select the option that is related to the third letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster.
CA : GH :: TK : ?
CA ==> (C+4) (A+7) ==>Â GH
TK ==> (T+4)Â (K+7) ==> XR
So 'XR' will come in place of the question mark.
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