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It sure does sound like that cog is worn. If the cog is severly worn, putting a new chain on will sometimes make the problem worse, since the old chain had worn and would mesh properly with the equally worn teeth. Now that the chain is fresh, the worn cog may want to skip. If you have a lot of miles on that cassette, especially if you use that cog a lot [ likely since it is towards the middle of the cassette] then I would replace the cassette.
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