Sub Articulo 146.1
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In the preambule put
\newif\iffullversion
Then you can either put the switches
\fullversiontrue
or
\fullversionfalse
in your document, or (I prefer the latter variant) put just the line
\input{version.cfg}
in your document. The file version,cfg should be the following;
% If you want full version, uncomment this line
\fullversiontrue
% Otherwise, uncomment this line
%\fullversionfalse
Then in the document itself you can write
\iffullversion
Long text to hide
\fi
or (again, I prefer this variant):
\iffullversion
Long text to hide
\else
This section is omitted in the condensed version. To typeset it,
change \texttt{version.cfg}, and run \LaTeX{} again.
\fi