Scope note

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This property associates an instance of E4 Period with the 4 dimensional point sets (volumes) in spacetime that it occupied. This instance of SP1 Phenomenal
Spacetime Volume includes the trajectories of the participating physical things during their participation in the instance of E4 Period, the open spaces via which they have interacted and the spaces by which they had the potential to interact during that period or event in the way defined by the type of the respective period or event, such as the air in a meeting room transferring the voices. It also comprises the areas controlled by some military power. Therefore instances of E4 Period have fuzzy boundaries in spacetime.

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