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Apologies I left this out last night, in the Introduction to Programming in Emacs Lisp .On the Preface section , title a note to a novice. The indent-region key chord is switch.
ie, second paragraph, last sentence
But usually ‘M-C-\’ means press the <CTRL> key along with the key that is labeled <ALT> and, at the same time, press the ‘\’ key.
In GNU Emacs 31.0.50 (build 1, aarch64-unknown-linux-android21) of
2025-04-29 built on xeon
Repository revision: 825ea052ad5638c056037c4cac92c9e666dc3820
Windowing system distributor 'Xiaomi', version 34.0.0
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