theorem instThreeDimensionalSpatialRegionIsToParent
theorem instThreeDimensionalSpatialRegionIsToParent: ∀ (x : Type) [ThreeDimensionalSpatialRegion.Is x], SpatialRegion.Is x
theorem instThreeDimensionalSpatialRegionIsToParent
theorem instThreeDimensionalSpatialRegionIsToParent: ∀ (x : Type) [ThreeDimensionalSpatialRegion.Is x], SpatialRegion.Is x