Exercise 3.29 An or-gate as a compound digital logic device
nameless

Code Review

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    (define (or-gate a1 a2 output)
  (let ((b1 (make-wire))
        (b2 (make-wire))
        (c (make-wire)))
    (inverter a1 b1)
    (inverter a2 b2)
    (and-gate b1 b2 c)
    (inverter c output)
    'ok))