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diff --git a/src/stlplus/strings/print_ntree.hpp b/src/stlplus/strings/print_ntree.hpp
new file mode 100644
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--- /dev/null
+++ b/src/stlplus/strings/print_ntree.hpp
@@ -0,0 +1,33 @@
+#ifndef STLPLUS_PRINT_NTREE
+#define STLPLUS_PRINT_NTREE
+////////////////////////////////////////////////////////////////////////////////
+
+//   Author:    Andy Rushton
+//   Copyright: (c) Southampton University 1999-2004
+//              (c) Andy Rushton           2004-2009
+//   License:   BSD License, see ../docs/license.html
+
+//   Generate a string representation of an ntree
+
+////////////////////////////////////////////////////////////////////////////////
+#include "strings_fixes.hpp"
+#include "ntree.hpp"
+#include <string>
+#include <iostream>
+
+////////////////////////////////////////////////////////////////////////////////
+
+namespace stlplus
+{
+
+  template<typename T, typename S>
+  void print_ntree(std::ostream& device,
+                   const ntree<T>& values,
+                   S print_fn,
+                   const std::string& separator = "|",
+                   const std::string& indent_string = "  ");
+
+} // end namespace stlplus
+
+#include "print_ntree.tpp"
+#endif