{HEAD ~ The pounding movement} of the bar screen now drives the ice downward and the buoyant force of {TAIL ~ the water} returns them to the bar screen 
{ HEAD ~ The pounding movement } of the bar screen now drives the ice downward and the buoyant force of { TAIL ~ the water } returns them to the bar screen
HEAD 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 OTH OTH OTH OTH OTH OTH