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In my Emacs 'C-h k M-o' displayes 
M-o runs the command dired-omit-toggle
   which is an interactive compiled Lisp function in `dired-x'.
(dired-omit-toggle &optional FLAG)
.....

I try '(dired-omit-mode 1)' , but
Symbol's function definition is void: dired-omit-mode

And '(dired-omit-toggle 1)' don't make any effect.

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