Comments by "kazedcat" (@kazedcat) on "Defining Every Number Ever" video.
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There are sets not in Naturals for example sets {0,2} and {1,2} you can use this two for tagging. This set are distinct from {},{0},{0,1},{0,1,2} which are the set represented by 0,1,2 and 3. Sets {0,2} and {1,2} are not in Naturals.
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