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From WordPress Codex:

<?php remove_action( $tag, $function_to_remove, $priority ); ?>

This function is an alias to remove_filter().

This function removes a function attached to a specified action hook. This method can be used to remove default functions attached to a specific action hook and possibly replace them with a substitute. See also remove_filter(), add_action() and add_filter().

Important: To remove a hook, the $function_to_remove and $priority arguments must match when the hook was added. This goes for both filters and actions. No warning will be given on removal failure.

$tag
(string) (required) The action hook to which the function to be removed is hooked.

Default: None
$function_to_remove
(callable) (required) The name of the function which should be removed.

Default: None
$priority
(int) (optional) The priority of the function (as defined when the function was originally hooked).

Default: 10

Return
(boolean)

Whether the function is removed.
True – The function was successfully removed.
False – The function could not be removed.


From Wordpress Code Reference:
adjacent_posts_rel_link__F9J_head()

Displays relational links for the posts adjacent to the current post for single post pages.
This is meant to be attached to actions like ‘_F9J_head’. Do not call this directly in plugins or theme templates.