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+# Contributors
+
+* Brett Alistair Kromkamp (brettkromkamp@gmail.com): Post basic idea online.
+* Xiaming Chen (chenxm35@gmail.com): Finished primary parts and made the library freely public.
+* Holger Bast (holgerbast@gmx.de): Replaced list with `dict` for fast node index and optimized the performance.
+* Ilya Kuprik (ilya-spy@ynadex.ru): Added ZIGZAG tree-walk algorithm to tree traversal.
+
+and other committers etc.
+
+Thank you all.