{HEAD ~ The additional cost} in {TAIL ~ the assembly} is negligible in view of the advantages of the modular construction 
{ HEAD ~ The additional cost } in { TAIL ~ the assembly } is negligible in view of the advantages of the modular construction
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH