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You probably noticed that the site looks very different due to a major upgrade that lets pages load faster, better organizes the content, is easier to navigate and search, and now offers dark and light modes. Of course everything remains free to support your learning.
One consequence is that we must ask you as a one-time thing to create a new account to use this improved site. (Resetting your password alone will not work.) Rest assured that your saved data for each problem you marked will be migrated to the new account as long as you use the same email address as you did when you registered initially. We will have those data on this site very soon. If you need help, please contact us at support@matheno.com or via the Contact Us form.
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