power x' Cons x xs mult x' power x' xs mult x' Cons x xs add0 x' mult x' xs add0 x' Cons x xs Cons Cons Nil Nil add0 x' xs power x Nil Cons Nil Nil mult x Nil Nil add0 x Nil x goal x y power x y power 2 Cons 2 mult 2 add0 2 Nil 0 goal 2 INNERMOST