code: def FindCoinsByVins(self, vins):
          
          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
docs: 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.