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A fan of the # SanFrancisco Crosstown Trail posted his tribute " Straight Up ," a walking route straight up the middle from the south side of SF up to the Golden Gate. Monday, I walked it. I got a hint that my timing might not have sync&#x27;d up with the author&#x27;s intent when I read the route instruction "As it [Pope Street] turns north, look down the street and you’ll see Mt. Davidson…