When {HEAD ~ the lid} is in {TAIL ~ the first position} it covers substantially all of the top opening of the container 
When { HEAD ~ the lid } is in { TAIL ~ the first position } it covers substantially all of the top opening of the container
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH