{HEAD ~ The walkway} is parallel to {TAIL ~ the lift beams} and is secured to the cross beams 
is parallel to
{ HEAD ~ The walkway } is parallel to { TAIL ~ the lift beams } and is secured to the cross beams
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH