{TAIL ~ Another possible method} is to remove {HEAD ~ the olefin treated titanium halide} from the solvent, wash it, if necessary, to remove excess olefin, and then add the electron donor either directly or in solution with an inert solvent 
{ TAIL ~ Another possible method } is to remove { HEAD ~ the olefin treated titanium halide } from the solvent , wash it , if necessary , to remove excess olefin , and then add the electron donor either directly or in solution with an inert solvent
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