SOE ex.1.1
simple x y z = x * (y + z)
simple (simple 2 3 4) 5 6
= (simple 2 3 4) * (5 + 6)
= (2 * (3 + 4)) * 11
= (2 * 7) * 11
= 14 * 11
= 154
simple (simple 2 3 4) 5 6
= simple (2 * (3 + 4)) 5 6
= simple (2 * 7) 5 6
= simple 14 5 6
= 14 * (5 + 6)
= 14 * 11
= 154