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diff --git a/src/stlplus/strings/print_ntree.tpp b/src/stlplus/strings/print_ntree.tpp
new file mode 100644
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--- /dev/null
+++ b/src/stlplus/strings/print_ntree.tpp
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+////////////////////////////////////////////////////////////////////////////////
+
+//   Author:    Andy Rushton
+//   Copyright: (c) Southampton University 1999-2004
+//              (c) Andy Rushton           2004-2009
+//   License:   BSD License, see ../docs/license.html
+
+////////////////////////////////////////////////////////////////////////////////
+
+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)
+  {
+    for (TYPENAME ntree<T>::const_prefix_iterator i = values.prefix_begin(); i != values.prefix_end(); i++)
+    {
+      if (i != values.prefix_begin()) device << separator;
+      for (unsigned indent = values.depth(i.simplify()); --indent; )
+        device << indent_string;
+      print_fn(device, *i);
+    }
+  }
+
+} // end namespace stlplus
+