punctuation - Long dashes between sentences


In Ludwig Wittgenstein's writings, I often see long dashes (both em-dash, and one even longer, shown in red circles). I can sense (at least I believe I do—perhaps, from the writer's point of view, the two thoughts are tightly-connected, yet they have to be separate sentences) their function; but is there such a usage? Never seen any punctuation guide mentioning such a usage.


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