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Chengdu proposal for carrier based J-20 (top)
This has been posted before. Back then, I have pointed out that this was made by fans as a serious paper would not use such terms as "兄弟". Not only that, you can't simply make the wing swept forward on the J-20, as that would completely alter the the aerodynamics and make the plane in-flyable. Basically, the diagram is just something formatted to look like an internal document when it isn't.