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The phrase "by by" is not a grammatically correct construction and is not typically used in written English.
It may be used informally in spoken English as a way of saying goodbye, but it would not be considered grammatically correct or formal enough for written communication. Example: "I'll see you later, by by!" (Informal spoken goodbye).
Exact(60)
Photograph by by Junko Kimura/Getty.
By By By Rivka Galchen By Jia Tolentino.
By By By Miranda Carter By Amos Barshad.
By By By Jelani Cobb By David Remnick.
By By By Richard Brody By Phil Klay.
By By By Rivka Galchen By Larissa MacFarquhar.
By By By Alexandra Schwartz By Rivka Galchen.
By By By Emily Anthes By Rivka Galchen.
By By By Larissa MacFarquhar By Rivka Galchen.
By By By John Cassidy By Adam Davidson.
Some kids get by by memorizing.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com