Here is a summary of the 15 punctuation marks.
It explains what you should do with each one. I understand why that is useful.
It also rates them on how hard they should be to learn. Why do we need to know that? Are we supposed to work through them in order? If so, I suspect the types of dashes are given too high a priority.
Or perhaps it is a plot to make us feel good if we find something easier than the crowd does.
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