Suppose e is the expression (* 2 (+ 3 4)) and f is the subexpression (+ 3 4), then the continuation of f in e is
(* 2 (+ 3 4))
(+ 3 4)
(lambda(n) (* 2 n))
and
((lambda(n) (* 2 n)) (+ 3 4))
produces the same result of 14 as does