Flag answer as duplicate of another answer

Our recent hot post (Threaded comments are here!). I had wrote some answers in that question. And, there's lot of answers also. Even, currently I don't have much more time to read all of those answers. I had requested the feature(make a general thread by default). @luap42 had said that lot of people had requested the same feature also. I don't have much more to read all those answers, that's why I had posted the same answer without any knowledge. Even, I invest some time to write that answer. That's why I am not deleting that post (I will delete if necessary). So, I wasn't first person who requested for the feature. And, the first person may think that I had just copied his/her idea to earn reputation. And, new reader upvote in answer if they think that's helpful. So, if there was a way to flag as duplicate to first post than, new reader may go to upvote that answer. So, it will be helpful for everyone that's what I think.