why do you think this happened ?
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it looks like both parts - "you think" and "has happened" require the same word - "what" but here is only one "what". If we give this "what" to "you think" then "has happened" will have no noun. If we will do conversely by giving "what" to "has happened" then "you think" will be left without this "what". Or it can be for both of them having only one "what", not two and so on
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