00:00We are all familiar with using the unique function which extract distinct item from the list using
00:05this formula. However, if our objective is to identify item that appear only once in our list,
00:11how would you tackle that task? Well, it's quite simple actually. The unique function has three
00:17arguments, with the second and third being optional. If you don't specify the last two arguments,
00:23it defaults to false. In order to acquire the item that only appear once in our list,
00:28set the third argument to true like this, and the job is completed.
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