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Hey. I'm a CS student at TU Delft, the Netherlands, and a part-time web developer.
Etymology of transitive/intransitive verb pairs
Thanks for that great answer. You mention the shift of ~uru to ~eru, but then you list 落つ→落ちる. Was it some kind of sound change that produced 上一段 verbs? Or might this actually be from 居る (would make a nice parallel to 在る)?