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May 26th, 2018
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  1. (letrec-syntax
  2. ((helper
  3. (syntax-rules ()
  4. ((_ () (backw ...))
  5. (quote (backw ...)))
  6. ((_ (arg rest ...)(backw ...))
  7. (helper (rest ...)(arg backw ...))))))
  8. (helper (1 2 3 4 5) ()))
  9. ; -> (5 4 3 2 1)
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