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by SpikeX 5239 days ago
I had the same question. It's a shame that the site doesn't have any additional information or links.

I'm also hesitant about the price... for $10 a month this service should support a large variety of languages and offer a lot of in-depth questions for each language. I can get the same knowledge elsewhere for free, so if I'm going to pay for this, it should be worth it.