[Haskell-beginners] Understanding some notation

I have this code snippet: import Data.List aaa x (y:ys) = case splitAt x (y:ys) of (n, x:xs) -> x:n ++ xs (n, xs) -> n ++ xs I understand what it's meant to do (that is, split a list at index `x` and make a new list with that element at the head, or just return the list when given a singleton), but my brain is failing me when trying to read the notation `n ++ xs`. Is there some obvious explanation that I'm just forgetting? ==== "Computer Science is no more about computers than astronomy is about telescopes." -- Edsger Dijkstra ====