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Robert Knight authored
Flipgrid no longer exists. URLs like https://flipgrid.com/s/030475b8ceff and the embedded variant (`?embed=true`) take you to a PDF file [1] telling you about the retirement of the service. [1] https://cdn-dynmedia-1.microsoft.com/is/content/microsoftcorp/microsoft/final/en-us/microsoft-product-and-services/microsoft-education/downloadables/flip-ms-edu.pdf
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