How to remove duplicate contacts on my samsung s6 edge.?
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If they are duplicated under the same account then you need to do it manually, if you are talking about you seeing the same Contacts duplicated but because of different Accounts (Facebook, Whatsapp, Multiple Google Accounts, etc...) then just go to Contacts and click More at the top right and use the Merge Contacts options. You can select there which you want to merge.
Also, you are seeing duplicated contacts because by default it's set like that to show all contacts from all accounts, but if you go to Contacts-Settings, there you will find the Contacts to Display option that allow you to select which ones to show.