Part A

(* 
name: ander
argument: a list
returns: a boolean value 
*)

fun ander nil = true
	| ander (x::xs) = x and ander xs




(*
name: span
1st argument: a list
2nd argument: a function
returns: a tuple containing two list
*)


name: alternating_sum
argument: a list
returns: an integer value




Part B

name: isEmpty
argument: a list
return: a boolean value

name: push
1st argument: a value
2nd argument: a list
return: a list


name: pop
argument: a list
return: a list containing two lists (first one is the new stack, second
        sub-list has only one element, which is the one popped from stack)


name: multipush
1st argument: list of elements to be pushed
2nd argument: list (the stack)
return: a list


name: multipop
1st argument: an integer (number of elems to be popped)
2nd argument: a list (the stack)
return: a list containing two lists (first one is the new stack, second
        sub-list contains the elements that were popped)