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