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Aug 20th, 2014
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  1. {{"A", "B", "C", "D"}, Sequence @@ Partition[Range@20, 4]}
  2.  
  3. Through[{First, Rest}[%]];
  4. AssociationThread[First@% -> #]& /@ Last@% // Dataset
  5.  
  6. Query[All, <|"A" -> #A, "B" -> #B, "new" -> {#C, #D}|>&]@%
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