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	Class	Description
	b2AABB	An axis aligned bounding box.
	b2ContactID	We use contact ids to facilitate warm starting.
	b2ContactPoint	This structure is used to report contact points.
	b2ManifoldPoint	A manifold point is a contact point belonging to a contact manifold.
	b2OBB	An oriented bounding box.
	b2Segment	A line in space between two given vertices.
	Features	We use contact ids to facilitate warm starting.