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