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What do a $155 million Picasso purchase, a $60 million Hamptons home purchase, a $600 million fine and a trader in handcuffs have in common? The answer: a momentous week for high-profile hedge-fund titan Stephen A. Cohen. Plus, oil companies say new EPA rules on sulfur levels in gas will increase prices several cents a gallon, but higher refining costs could play out many ways: People could drive less or they could buy cars with higher mileage.