Can someone break down this function for me? Dont really understand what the 'e' is.

Scala

def removeDupes2 [X] (xs:List[X]) : List[(Int, X)] = { // TODO: Provide definition here. xs.foldRight(List[List[X]]()){ (e, l) => l match { case (`e` :: xs) :: fs => (e :: e :: xs) :: fs case _ => List(e) :: l } }.map(f=> (f.length, f.head))

}