The tool may be shifted in different positions and orientations effective to provide {HEAD ~ an efficient cleaning action} on {TAIL ~ the article} to be cleaned 
on
The tool may be shifted in different positions and orientations effective to provide { HEAD ~ an efficient cleaning action } on { TAIL ~ the article } to be cleaned
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH