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%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  1. Auflage
%% 
%%  Beispiel 03-10-1 auf Seite 59.
%% 
%%  Copyright (C) 2013 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{examinimal}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{luacode}
\begin{luacode*}
function checknode(head)
  while head do
   if head.id==11 then head.kern=20*2^16 end -- entspricht pt
   if head.id==0 or head.id==1 then  checknode(head.head) end
   head=head.next
  end
return true
end
luatexbase.add_to_callback("post_linebreak_filter",checknode,"checknode")
\end{luacode*}
%StopShownPreambleCommands
\begin{document}
\fbox{abc1}
\end{document}