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My guess was Platanthera bifolia but that's also not it as the flower's shape is different.

No, it's not Platanthera bifolia. Do you have a photo with its leaves?
Apart from Herminium monorchis, the flower looks like wild cucumber's. But I don't think this is the case.

I guess that's not it as the single flower stems are delicate and thin and in Herminium monorchis they're much thicker and solid. But the whole plant look very similar.

It is a wild orchid, that's for sure. But which one?

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