{HEAD ~ A portion} of the cylindrical wall of the receptacle is provided with {TAIL ~ classifying openings}, for example by providing a screened opening as a band around the receptacle 
is provided with
{ HEAD ~ A portion } of the cylindrical wall of the receptacle is provided with { TAIL ~ classifying openings } , for example by providing a screened opening as a band around the receptacle
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH