Reverse Duplicate

Hi Brain,
Thank you so much for the script. I was trying with different data for the past two days. So far I have not faced any issues and it removes the duplicate pair as well. Also, I was trying to add the export the output in excel format along with this script but somehow I am getting error in that. But anyhow it solves the purpose of removing duplicates. I really appreciate your help. Thank you so much.
 
Regards,
Sri