May 1st, 2020
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  2. //Group elements by key, convert the iterable to list, then sort them in descending order, take the first 200 element
  3. //Sort the result RDD by key
  4. val sortedRdd = calcChiSquares.groupByKey().map{case(k,v) => (k ,
  5.                                                               v.toList.sortWith(_.split(":")(1).toDouble > _.split(":")(1).toDouble)
  6.                                                               .take(200).mkString(" "))}.sortByKey()
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