function _addTeamSale(uint256[9] _tokenIds, Sale _sale) internal {
        
        
        require(_sale.duration >= 1 minutes);
        
        for(uint ii = 0; ii < 9; ii++) {
            require(_tokenIds[ii] != 0);
            require(nonFungibleContract.exists(_tokenIds[ii]));

            tokenIdToSale[_tokenIds[ii]] = _sale;
        }

        emit TeamSaleCreated(
            _tokenIds,
            uint256(_sale.startingPrice),
            uint256(_sale.endingPrice),
            uint256(_sale.duration),
            uint256(_sale.startedAt)
        );
    }