{HEAD ~ The monoanionic osmium catalyst} also exhibits {TAIL ~ an increased selectivity} toward the straight chain product 
exhibits
{ HEAD ~ The monoanionic osmium catalyst } also exhibits { TAIL ~ an increased selectivity } toward the straight chain product
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH