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And there are sections on Klingon table manners ; do n't ask someone to pass something , and if you tell the server he got your order wrong , have a knife handy . In addition , read the item descriptions ; do n't just rely on pictures . Keep an eye ( and hand ) on handbags and backpacks ; do not hang them from a chair in restaurants . Thus , when we take the natural and the publicly-provided risk management tools into account , what we really find is that many producers already had the nearly optimal hedge protection without entering the marketplace , and additional risk management products probably increased risk for many producers ; did not decrease risk .