val ints = [2,17,10];

fun moreThanSquare x =
 let val additional = 1;
     fun square x = x * x;
 in 
  (square x) + additional
 end;

fun lastElementOr17 l =
 foldl (fn (x,y) => x) 17 l;

val firstElementOr17 =
 foldr (fn (x,y) => x) 17;