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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def FindCoinsByVins(self, vins):
 """ Looks through the current collection of coins in a wallet and chooses coins that match the specified CoinReference objects. Args: vins: A list of ``neo.Core.CoinReference`` objects. Returns: list: A list of ``neo.Wallet.Coin`` objects. """

        ret = []
        for coin in self.GetCoins():
            coinref = coin.Reference
            for vin in vins:
                if coinref.PrevIndex == vin.PrevIndex and \
                        coinref.PrevHash == vin.PrevHash:
                    ret.append(coin)
        return ret