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Being a single page app, this app should be extremely easy to learn. There are very few options and as such it is simple to learn. This simplicity also makes the application extremely efficient because you don't have to click through many menus to do what you need. Every timer is visible from the main page and is one mouse click away from being expanded. Because only the creator of a timer can edit or delete it, it is very safe for the creator of a timer. A safety issue that could come up is when a creator deletes a timer that other people rely on.
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