{HEAD ~ The center portion} 46 preferably has {TAIL ~ a center} opening 48 on the side adjacent the open top end 44A of the body 44 
preferably has
{ HEAD ~ The center portion } 46 preferably has { TAIL ~ a center } opening 48 on the side adjacent the open top end 44A of the body 44
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH