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> I imagine those "early line and character editors" refers to vi's delete, yank, and put, and emacs's kill, copy/"save as if killed", and yank.

No, 1974 predates both vi and Emacs

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You're right, I missed that. Vi's predecessor ex, which also had these operations, is from '76, so it also couldn't be it. However, Emacs's TECO, which also had yank, is from '62/'63, so that might've been one.

https://en.wikipedia.org/wiki/Ed_(text_editor)

Ed doesn't seem to have those operations. GNU ed's documentation includes yank, but it's not described in POSIX.

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