diff --git a/java/examples/Books/Processing Handbook/Appendices/Appendix E/_10/_10.pde b/java/examples/Books/Processing Handbook/Appendices/Appendix E/Ex_10/Ex_10.pde
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rename from java/examples/Books/Processing Handbook/Appendices/Appendix E/_10/_10.pde
rename to java/examples/Books/Processing Handbook/Appendices/Appendix E/Ex_10/Ex_10.pde