{HEAD ~ A medical technique} comprises {TAIL ~ the steps} of attaching a hammock to the head rail and foot rail of a crib, and placing a child in the hammock 
{ HEAD ~ A medical technique } comprises { TAIL ~ the steps } of attaching a hammock to the head rail and foot rail of a crib , and placing a child in the hammock
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH