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Unlock more sets

I wonder how to unlock more sets?

If I send the link to my friends by email or chatting, what would he/she do so that I can unlock my sets?

Thank you.

Note by Duy Bk
4 years, 1 month ago

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Create an account. If they create an account using your invite link, you will unlock some problem sets. Tim Vermeulen · 4 years, 1 month ago

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