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You are viewing a lesson, but are not seeing any video or audio players.

A missing video or audio player is typically due to a missing plugin in your browser.

  1. Verify that you have the correct browser plugins by visiting the plugin check page.
  2. If you notice any of the plugins have a red x, follow the steps below that plugin to download the appropriate installation program.

If you need help installing or verifying a plugin, please contact support at

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