When the lid is in the second position it covers {HEAD ~ only a portion} of {TAIL ~ the top opening} of the container 
of
When the lid is in the second position it covers { HEAD ~ only a portion } of { TAIL ~ the top opening } of the container
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH