We present several Varlang programs below. For each program write down the free and bound variables. If a program does not have free variable, say None.

(a) (let ((a 1)) (/ a 2))

(b) (let ((c 3) (c p)) (let ((s 2)) (+ c l s)))

(c) (let ((g 6)(y 5)) (let ((x y)) x))

(d) (+ s (let ((x (+ 2 (let ((x 23) y) ))))x))

(e) (let ((q 5)) (let ((r q)) r))