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