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