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@@ -1973,10 +1973,20 @@ When this mode is active and the cursor is on a line that looks to Org like a
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headline or the first line of a list item, most structure editing commands
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will work, even if the same keys normally have different functionality in the
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major mode you are using. If the cursor is not in one of those special
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-lines, Orgstruct mode lurks silently in the shadows. When you use
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-@code{orgstruct++-mode}, Org will also export indentation and autofill
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-settings into that mode, and detect item context after the first line of an
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-item.
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+lines, Orgstruct mode lurks silently in the shadows.
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+
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+When you use @code{orgstruct++-mode}, Org will also export indentation and
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+autofill settings into that mode, and detect item context after the first
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+line of an item.
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+
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+@vindex orgstruct-heading-prefix-regexp
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+You can also use Org structure editing to fold and unfold headlines in
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+@emph{any} file, provided you defined @var{orgstruct-heading-prefix-regexp}:
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+the regular expression must match the local prefix to use before Org's
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+headlines. For example, if you set this variable to @code{"^;; "} in Emacs
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+Lisp files, you will be able to fold and unfold headlines in Emacs Lisp
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+commented lines. Some commands like @code{org-demote} are disabled when the
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+prefix is set, but folding/unfolding will work correctly.
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@node Tables, Hyperlinks, Document Structure, Top
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@chapter Tables
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