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Emacs can hide lines indented more than a certain number of columns
(you specify how many columns). This allows you to get an overview of
a part of a program.
To hide lines, type `C-x $' (`set-selective-display') with a numeric
argument N. (Note: Arguments, for information on giving the
argument.) Lines with at least N columns of indentation disappear from
the screen. The only indication of their presence are three dots
(`...'), which appear at the end of each visible line that is followed
by one or more invisible ones.
The invisible lines are still present in the buffer, and most editing
commands see them as usual, so it is very easy to put point in the
middle of invisible text. When this happens, the cursor appears at the
end of the previous line, after the three dots. If point is at the end
of the visible line, before the newline that ends it, the cursor
appears before the three dots.
The commands `C-n' and `C-p' move across the invisible lines as if
they were not there.
To make everything visible again, type `C-x $' with no argument.
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