It has been shown that this additional forward movement influences very favorably {HEAD ~ the quality} of {TAIL ~ the loosening layer} 
of
It has been shown that this additional forward movement influences very favorably { HEAD ~ the quality } of { TAIL ~ the loosening layer }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL