<NA>
<NA>
function allowance(address owner_, address spender)
        public
        view
        returns (uint256)
    {
        return _allowance[owner_][spender];
    }
/**
 * @dev Function to check the amount of tokens that an owner has allowed to a spender.
 * @param owner_ The address which owns the funds.
 * @param spender The address which will spend the funds.
 * @return The number of tokens still available for the spender.
 */