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| Oppia is a free site for sharing knowledge via interactive lessons called explorations. Learn from user-created explorations, or teach and create your own. Think outside the books. |
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| Hi! Welcome to the World site navigation. From here you find the site, but also can recommend the site to here. Submission is free to join is immediate. Now Submit |
| This is a compendia introduction Oppia site, this site has been included
among the Education category. Any requests and suggestions should be sent
to: emailese@163.com |
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