{HEAD ~ The insulation system} includes {TAIL ~ insulating boards} which are suspended beneath roof panels by flexible sheets of material 
includes
{ HEAD ~ The insulation system } includes { TAIL ~ insulating boards } which are suspended beneath roof panels by flexible sheets of material
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