![]() ![]() In the vehicle example, when the SOP number reaches "99999" no additional numbers are available without causing duplicate numbers. SOP in a vehicle odometer can be thought of as 54321 where the right dial is constantly rotating and the left dial changes least often. Uniformly, rotation "3" begins changing each time rotation "2” reaches "9", rotation "4" begins changing each time rotation "3" reaches "9" and rotation "5" changes each time rotation "4 reaches "9". Rotation "2" changes each time rotation "1" returns to the "0" position and starts to rotate again through the numbers. As the vehicle moves ahead, rotation "1" constantly changes from "0" through "9". ![]() Vehicle odometers operate in units of 10. SOP can be readily explained by studying the odometer in any vehicle. The bottom row shown in red shows the sequence of progression (SOP) for this master key system. Chart 1 shows an example KB A with the top row showing the masterkey cuts- 11111, and the vertical rows showing the change key cuts to be used with each masterkey cut. A key bitting array consists of the masterkey cuts to be used, the change key cuts and the order they are to be used in each space, and the sequence of progression (SOP). Terms used in this article may not conform to tightly held terms used by others but are meant to provide the simplest explanation of a complex subject. Building any master key system begins with a plan, often called a key bitting array (KBA). ![]()
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