reference to four steps of Routine 3 Revised, EngramRunning by Chains, used to run through an incident as needed after the incidenthas been contacted and gone through the first time. The letters stand for the commands which the auditor gives the pc: (A) "Move to the beginning of the incident," (B) "Tell m e when you are there," (C) "Scan through to the end of the incident," (D) "Tell m e what happened." If the incident is the earliest incident on that chain, this procedure is repeated until the incidenterases. Repeated use of these commands when the incident is not erasing (rather than finding an earlier incident on the chain) is called "grinding." —ExDn Lectures Approved Glossary: Expanded Dianetics (30 March 1972)