{HEAD ~ The system} also serves as a testing system for control umbilicals that usually are located near {TAIL ~ the pipelines} 
{ HEAD ~ The system } also serves as a testing system for control umbilicals that usually are located near { TAIL ~ the pipelines }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL