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So, George can apparently afford to make several round-trips to various countries around the world, but he doesn't bother to carry fifty dollars in cash with him?
Maybe he pays on credit card? or he asks his friends in the united states for help?
Maybe he was just feeling so cocky about his adventuring by the time he arrived in Syria that he simply didn't bother carrying any cash - he could have been expecting to fly back to Paris on the same day.