aegwenia/jik/hidden-foundation-report

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Hidden inputs: recursion and classification

A complete private-case example combining branching, abs, and tail recursion.

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(begin
  (define (triangular n acc)
    (if (= n 0) acc (triangular (- n 1) (+ acc n))))
  (define (foundation-report value limit)
    [(cond [(< value limit) .below]
           [(= value limit) .equal]
           [else .above])
     (triangular (abs value) 0)]))