{HEAD ~ Each pair} of {TAIL ~ bracing members} defines a guide for the displacement of the end supports of the support roller for the lower belt 
of
{ HEAD ~ Each pair } of { TAIL ~ bracing members } defines a guide for the displacement of the end supports of the support roller for the lower belt
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH