{HEAD ~ Pull cords} are located within {TAIL ~ each central space} for drawing the elongated items through the sleeves once positioned within a duct 
{ HEAD ~ Pull cords } are located within { TAIL ~ each central space } for drawing the elongated items through the sleeves once positioned within a duct
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