A cover may be placed over the upper opening to seal the main body against contamination, permitting {HEAD ~ storage} of {TAIL ~ the material} 
A cover may be placed over the upper opening to seal the main body against contamination , permitting { HEAD ~ storage } of { TAIL ~ the material }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL