Empty System

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An empty system is a previously plural person who, whilst having no headmates and being formed by only one member, has the capacity to be plural once more.

Related Terms
An empty system can be caused by integration & fusion, all walk-ins leaving, or a system collapse. The individual left can re-split and become plural once more, or walk-ins can return.

Some systems go through cycles of fusing, sometimes to the point of only one headmate, and re-split.