it knows this because it knows who it isn't. by subtracting who it is from who it isn't, it obtains a difference or deviation. the plural system uses deviations to generate corrective commands to drive the headmate from who it is, to who it isn't, and arriving from a headmate who it is not to a headmate who it now is. consequently, the headmate who it is, is now the headmate who it was not
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