I wrote a zip function to group the list as follows:
scala> def zipListBySize[T](size: Int)(list: List[T]) : List[List[T]]
= {
| var (first, second) = list.splitAt(size)
| if (second == Nil)
| List(first)
| else
| List(first) ++ zipListBySize(size)(second)
| }
zipListBySize: [T](Int)(List[T])List[List[T]]
scala> zipListBySize(5)(List
("1","2","3","4","5","6","7","8","9","10","11"))
res17: List[List[java.lang.String]] = List(List(1, 2, 3, 4, 5), List
(6, 7, 8, 9,
10), List(11))
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