{HEAD ~ The absorbers} preferably include {TAIL ~ two opposing aluminum containers} for containing particulate teflon beads 
preferably include
{ HEAD ~ The absorbers } preferably include { TAIL ~ two opposing aluminum containers } for containing particulate teflon beads
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH