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Arsenal manager Unai Emery insists the Gunners will not just sit back to try and protect their aggregate lead in the Europa League semi final second leg against Valencia on Thursday night, and will instead look to attack and be clinical when the possibility arises. Emery’s side hold a 3-1 advantage from the first leg in London last week and would be expected to see things through in the Mestalla. “Our idea is to play the match, thinking to win. [If] you want to win then you need to score,”…