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So it's 4:00 in the afternoon. I stop by the office, and there's that dilemma again. Coffee or....? A beer? A glass of wine? A kir? Is it late enough in the day for a cocktail? (Is it ever too early?) Or will a little caffeine power me through the witching hour of the evening and leave me with all my wits and a clear head tomorrow morning? In the summer it's an easier choice, somehow. What would you do?