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For any questions, please feel free to write to the following addresses. And I also warmly welcome bug reportings, suggestions and feedbacks. Only with your involvement can I make my products better. |
| isudoku@hotmail.com |
| isudoku@acrystalman.com |
For registration issues, I will reply in 1-2 business days. |
| For other questions, please allow 2-3 business days for me to process your request. |
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