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