Interlaced

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Interlaced is a descriptor for a set of partitionary headmates that are connected in such a way that changes to one affect the other.

For example, if one headmate introjected into themself and experienced a change in species, any headmates they were interlaced with would also experience a species change.

This could be for any reason; being in-system twins or clones, having formed from the same split, and being part of the same subsystem are some examples of things that could cause the connection.