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If we want to open a presentation already created, we have to click on the presentation icon that we would like to open and the click the 
icon. We can also double click on the presentation we want to work with to open it.
To duplicate a presentation we have to click on the presentation we want to duplicate and then click the 
icon. As an example, we would duplicate a presentation if we want that all our videos start and finish with our team shield.
To delete a presentation we have to click the 
icon and confirm by doing click on "ok" on the new pop-up window.
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