I'm not sure if this question has been asked before. Basically, some questions have answers in other websites which are somehow related to this site. For example, there are several examples in here texample.net. Now if someone asks a question and it happens that the answer is in the aforementioned website, can we consider the question duplicate? An example for this scenario is in herehere where the solution is in this link . I'm asking this because external links can be removed or moved any times.
replaced http://tex.stackexchange.com/ with https://tex.stackexchange.com/