Section 50
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       # GATE testing alternate primer based on gates: COS_OSC circuit
       # This section contains one or more representations of a circuit
       # constructed using UNLESS gates. Needs elaboration...
       # graphic representation :
       #
[hear] (define cos_osc_gate /
         vector
          (vector 4 8 6 8 (true))
          (vector 6 8 8 8 (true))
          (vector 8 6 8 8 (true))
          (vector 10 6 8 6 (true))
          (vector 8 8 10 8 (false))
          (vector 12 6 10 6 (false))
          (vector 10 8 12 8 (false))
          (vector 12 8 12 6 (false))
          (vector 12 8 14 8 (false))
          (vector 14 8 16 8 (false)));

[hear] (define cos_osc_image /
         make-image 120 169 /
         vector
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[hear] (equal (cos_osc_gate)
               (distill-circuit (cos_osc_image)));