Given vectors u = (u_1, u_2, ..., u_n) and v = (v_1, v_2, ..., v_n), the inner product of u and v is defined to be u_1 *v_1 + u_2 * v_2 + ... + u_n * v_n. Write a curried F# function inner that takes two vectors represented as int lists and returns their inner product (assuming the two lists are of equal length): > inner [1;2;3] [4;5;6];; val it: int = 32