{HEAD ~ The strength} of {TAIL ~ the bond} can be varied by varying the amount of the impregnant 
of
{ HEAD ~ The strength } of { TAIL ~ the bond } can be varied by varying the amount of the impregnant
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH