Remove duplicate values in a single Excel cell

I have a spreadsheet with hundreds of rows.  In column N, the contents within most cells contain duplicate values which are separated by a new line <Alt+Enter>. For example:

Cell N2 contains:

        CVE-2014-0411

        CVE-2014-0411

        CVE-2014-0453

        CVE-2014-0453

        CVE-2014-3020

        CVE-2014-3020

Cell N3 contains:

        CVE-2014-2631

        CVE-2014-2631

How do I get rid of the duplicates within each individual cell?  To be clear, I am not trying to remove duplicate rows. Just duplicates within the same cell.