Help: Delete DUPLICATE yahoo mail addresses/contacts on PHONE

[captfbgnet]

Have JB O/S on SG2: PHONE duplicates of Yahoo mail account addresses/contacts are shown, but NOT on computer. How to I delete the duplicates addresses on PHONE? Can't find any settings on Yahoo phone acct to do so, although on the computer duplicates can be deleted. A Google search wasn't too helpful. All help appreciated.