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+%% 
+%%  Ein Beispiel der DANTE-Edition
+%%  
+%%  1. Auflage
+%% 
+%%  Beispiel 03-10-2 auf Seite 60.
+%% 
+%%  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==37 then
+      if head.char==string.byte("c") then
+        n=head      -- Zwischenspeichern
+        head.prev.next=head.next  head.next.prev=head.prev
+        node.free(n) -- Speicher freigeben
+      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}