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Hey.
I would say the same as @kormath. no guarantee
If you use Klaas' method, you first have to find the upper book lungs.
If it is a female they are a bit further apart, there is more hair between them than with males, the room between the book lungs bulges a bit and there is no hairless point in the middle of between the upper book lungs. The epigastric furrow is also a bit massier.
If it is a male, they are closer to one another, there either is no hair or just a small hairless spot in the middle (there is an organ which we call “ventralesspinnfeld” in Germany but i have no clue how to say it in English) and the epigastric furrow is less massy it is a male.
Sorry but my english isn't the best.