{HEAD ~ Each disk} is positioned tangent to the surface of an AGA chip in {TAIL ~ a specific orientation} 
is positioned in
{ HEAD ~ Each disk } is positioned tangent to the surface of an AGA chip in { TAIL ~ a specific orientation }
HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL