//@20

const b2Vec2 = Box2D.Common.Math.b2Vec2;
const b2World = Box2D.Dynamics.b2World;
const b2Body = Box2D.Dynamics.b2Body;
const b2BodyDef = Box2D.Dynamics.b2BodyDef;
const b2Fixture = Box2D.Dynamics.b2Fixture;
const b2FixtureDef = Box2D.Dynamics.b2FixtureDef;
const b2PolygonShape = Box2D.Collision.Shapes.b2PolygonShape;