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+%%
+%% Ein Beispiel der DANTE-Edition
+%%
+%% 1. Auflage
+%%
+%% Beispiel 03-10-3 auf Seite 61.
+%%
+%% 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{52.91997pt}
+\setlength\parindent{0pt}
+%StartShownPreambleCommands
+\usepackage{luacode}
+\begin{luacode*}
+function checknode(head)
+while head do
+ if head.id==37 then
+ if head.char==string.byte("c") then
+ local n=node.new("glyph")
+ n.subtype=head.subtype n.char=head.char n.font=head.font
+ n.next = head head.prev.next = n
+ n.prev = head.prev head.prev = n
+ end
+ end
+ 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}