{HEAD ~ The insecticides} contain Propoxur, {TAIL ~ Pyretrines}, silicates and a combustible wax 
contain
{ HEAD ~ The insecticides } contain Propoxur , { TAIL ~ Pyretrines } , silicates and a combustible wax
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH