{HEAD ~ The helicopter} moves away from the tree, thereby breaking the connecting portion and allowing {TAIL ~ the upper portion} of the trunk to be carried away by helicopter 
{ HEAD ~ The helicopter } moves away from the tree , thereby breaking the connecting portion and allowing { TAIL ~ the upper portion } of the trunk to be carried away by helicopter
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH