; add and set numbers in scheme - David
  (let*
           (
              (a 1)
              (b 2)
              (c 3)
           )

        ;;(display + a b ) (newline)


        (set! c (+ 3 4 5 6 7 8 8 8 8))



        (display (+ c a b) ) (newline)

    )