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Correct version of inc! added by sjamaan on Tue Jan 26 14:54:51 2016

(define-syntax inc!
  (syntax-rules ()
    ((_ x)
     (set! x (+ x 1)))
    ((_ x delta)
     (set! x (+ x delta)))))
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Which one-argument R5RS procedure returns 2 when given `'(1 2 3)' as input?
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