What should we do to prevent users from creating duplicated subjects? For example, if one search ‘the Earth’ instead of ‘Earth’, that user is not going to find the subject ‘Earth’ (tested), therefore, that user probably will go create a subject called ‘the Earth’. But if so, there will exist two subjects with technically different names, yet actually refer to the same thing (the) Earth. If the second subject ‘the Earth’ is not discovered being duplicated in a certain time, the posts inside it will be too valuable to be deleted.
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