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; 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)

    )