{HEAD ~ Upper shell portion A} is threaded onto {TAIL ~ lower shell portion C} to form an airtight egg shaped container except for opening 3 
{ HEAD ~ Upper shell portion A } is threaded onto { TAIL ~ lower shell portion C } to form an airtight egg shaped container except for opening 3
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH