{HEAD ~ Extension} 42 extends {TAIL ~ the length} of tube 37 underneath boats 11, 12, 13, and 14 
extends
{ HEAD ~ Extension } 42 extends { TAIL ~ the length } of tube 37 underneath boats 11 , 12 , 13 , and 14
HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH