{HEAD ~ The containers} 12 and beams 14 may be made from {TAIL ~ a variety} of materials, including metals, composite material, ceramics and plastics, but are preferably rigid and light weight 
made from
{ HEAD ~ The containers } 12 and beams 14 may be made from { TAIL ~ a variety } of materials , including metals , composite material , ceramics and plastics , but are preferably rigid and light weight
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH