SML

Problem 5 (10 points) The Cartesian product (or cross product) of two sets, S1 and S2, is often denoted by the symbol and is defined follows: S1 S2 = {(x, y) | x ? S1 ? y ? S2}. Using tuple and list notation, write a function called crossProduct: 0a list ? 0 b list ? ( 0a ? 0 b) list that takes two lists as input and returns their Cartesian product.