Have you been received fake money?

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There are many kinds of money in the world,They made by difficult stuff.and the country always make it special in case be copy.I just strange that how the people can produce the fake money?but the ture is that I have seem the fake money in usual living.And we can't distinguish it at the first time.and it was actually the same as the true one.Our country have make up law to protect the money been modelled on. How about your country?what the kind of meterial made?Have you been received fake money before?