said corrugations being {HEAD ~ the only protuberances} of {TAIL ~ said pipe} between said joints, 
of
said corrugations being { HEAD ~ the only protuberances } of { TAIL ~ said pipe } between said joints ,
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH