GROUP
 # Reflect about X and Z axes
  1 0 0 0	0 1 0 0	0 0 1 0	0 0 0 1

  1 0 0 0	0 1 0 0	0 0 -1 0	0 0 0 1

  -1 0 0 0	0 1 0 0	0 0 1 0	0 0 0 1

  -1 0 0 0	0 1 0 0	0 0 -1 0	0 0 0 1

unit { =
 LIST
 { = INST # Semicircular ends of torus
transform
  1 0 0 0	0 1 0 0	0 0 1 0	2 0 0 1
  unit { < http://www.geom.umn.edu/locate/weboogl/objects/pieces/linkA.bez }
 }
 { = GROUP # Joining pieces
  1 0 0 0	0 1 0 0	0 0 1 0	-2 0 0 1
  1 0 0 0	0 -1 0 0	0 0 1 0	-2 0 0 1
  unit { < http://www.geom.umn.edu/locate/weboogl/objects/pieces/linkB.bez }
 }
}