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hmm.. your question is a bit uncleear, but I'd say an example could be when two countries build a bridge over a river (border) in order to improve the communication. in such case the two of them need to invest some money in it and cooperate. another one would be maybe when a European country sends food to another country, eg. in Asia which was hit by a natural catastrophy. in this case one gives helps and the other one receives it. is that enough?
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