[Mathematical logic (miscellaneous).]

In the wallet, there are 2 coins with a total value of 15 kopecks. One of them is not a five-kopeck coin. What are these coins?

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Two coins can only be 5 kopecks and 10 kopecks. If one of them is not a five-kopeck coin, then it is a ten-kopeck coin, and the other one is a five-kopeck coin.