Where does the name grep come from, as Brian Kernighan explains it?

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Brian Kernighan explained that grep comes from the ed text editor, the first real editor on Unix. In ed, the g command runs another command on every line matching a regular expression, and the form g/re/p prints all lines that match the pattern. The name grep is simply that command sequence. Kernighan credited Ken Thompson with telling the story best.

Where does the name grep come from, as Brian Kernighan explains it?

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