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a "hurdy-gurdy" was a musical instrument played by turning a crank so that a wheel striking strings in turn caused music. The "hurdy-gurdy" system was so called because the auditor went round and round the points of the ARC triangle (A-R-C) plus enforced and dominate, inhibit and nullify on persons the pc had known, session after session to restore his memory. Mentioned on page 65, Book 2, Science of Survival and described in full later in that same chapter on pages 77-83.
(LRH Def. Notes)