Google Script / Conditional Formatting to find & highlight duplicate and potential duplicate values.

Dear Sir or Ms. I am John, pleased to meet you. I'm well experienced in Google Apps Script and Google Docs. Please, take a look at my portfolio in my profile or here : [login to view URL] Can meet all your requirements. Thank you for your time ! John

hi, i can create the functionality which will find duplicate values from two separate columns. I can start the work now only.

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Shall we have a discussion.

I can do this but , can u please give the list or the database column from whom the duplicate is to be found