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Dec 14th, 2018
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  1. (define (counter% i)
  2. (make-object
  3. (list 'get (lambda (s al) i))
  4. (list '+ (lambda (s al) (counter% (+ (s 'get) (car al)))))
  5. (list '- (lambda (s al) (counter% (- (s 'get) (car al)))))))
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