{HEAD ~ The catalyst} may comprise {TAIL ~ 0.05% to 1.0%} by volume of the catalyst solution, preferably 0.125% to 0.25% by volume of the catalyst solution 
comprise
{ HEAD ~ The catalyst } may comprise { TAIL ~ 0.05 % to 1.0 % } by volume of the catalyst solution , preferably 0.125 % to 0.25 % by volume of the catalyst solution
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH