{HEAD ~ One possibility} is to install {TAIL ~ such a module} in the region 206 after the lower sand face completion section has been assembled but before the upper sand face completion section 204 is installed 
is to install
{ HEAD ~ One possibility } is to install { TAIL ~ such a module } in the region 206 after the lower sand face completion section has been assembled but before the upper sand face completion section 204 is installed
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL 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 OTH OTH OTH OTH OTH