The second clamp 14 opens by removing a primary pin and a safety pin in {TAIL ~ the nature} of {HEAD ~ the first clamp} 
The second clamp 14 opens by removing a primary pin and a safety pin in { TAIL ~ the nature } of { HEAD ~ the first clamp }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD