a) <br /> co <br /> N <br /> 0 <br /> 0 <br /> 0 <br /> O <br /> O <br /> CD <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> U <br /> 0 <br /> 0 <br /> u <br /> 0 0 <br /> 0 <br /> CO <br /> is <br /> 0 <br /> 0 <br />