diff --git a/module3/exo3/exercice_python_en.org b/module3/exo3/exercice_python_en.org
deleted file mode 100644
index 5782f493934678ba782fb65634a4d86e5f3adefc..0000000000000000000000000000000000000000
--- a/module3/exo3/exercice_python_en.org
+++ /dev/null
@@ -1,94 +0,0 @@
-#+TITLE: Your title
-#+AUTHOR: Your name
-#+DATE: Today's date
-#+LANGUAGE: en
-# #+PROPERTY: header-args :eval never-export
-
-#+HTML_HEAD:
-#+HTML_HEAD:
-#+HTML_HEAD:
-#+HTML_HEAD:
-#+HTML_HEAD:
-#+HTML_HEAD:
-
-* Some explanations
-
-This is an org-mode document with code examples in R. Once opened in
-Emacs, this document can easily be exported to HTML, PDF, and Office
-formats. For more information on org-mode, see
-https://orgmode.org/guide/.
-
-When you type the shortcut =C-c C-e h o=, this document will be
-exported as HTML. All the code in it will be re-executed, and the
-results will be retrieved and included into the exported document. If
-you do not want to re-execute all code each time, you can delete the #
-and the space before ~#+PROPERTY:~ in the header of this document.
-
-Like we showed in the video, Python code is included as follows (and
-is exxecuted by typing ~C-c C-c~):
-
-#+begin_src python :results output :exports both
-print("Hello world!")
-#+end_src
-
-#+RESULTS:
-: Hello world!
-
-And now the same but in an Python session. With a session, Python's
-state, i.e. the values of all the variables, remains persistent from
-one code block to the next. The code is still executed using ~C-c
-C-c~.
-
-#+begin_src python :results output :session :exports both
-import numpy
-x=numpy.linspace(-15,15)
-print(x)
-#+end_src
-
-#+RESULTS:
-#+begin_example
-[-15. -14.3877551 -13.7755102 -13.16326531 -12.55102041
- -11.93877551 -11.32653061 -10.71428571 -10.10204082 -9.48979592
- -8.87755102 -8.26530612 -7.65306122 -7.04081633 -6.42857143
- -5.81632653 -5.20408163 -4.59183673 -3.97959184 -3.36734694
- -2.75510204 -2.14285714 -1.53061224 -0.91836735 -0.30612245
- 0.30612245 0.91836735 1.53061224 2.14285714 2.75510204
- 3.36734694 3.97959184 4.59183673 5.20408163 5.81632653
- 6.42857143 7.04081633 7.65306122 8.26530612 8.87755102
- 9.48979592 10.10204082 10.71428571 11.32653061 11.93877551
- 12.55102041 13.16326531 13.7755102 14.3877551 15. ]
-#+end_example
-
-Finally, an example for graphical output:
-#+begin_src python :results output file :session :var matplot_lib_filename="./cosxsx.png" :exports results
-import matplotlib.pyplot as plt
-
-plt.figure(figsize=(10,5))
-plt.plot(x,numpy.cos(x)/x)
-plt.tight_layout()
-
-plt.savefig(matplot_lib_filename)
-print(matplot_lib_filename)
-#+end_src
-
-#+RESULTS:
-[[file:./cosxsx.png]]
-
-Note the parameter ~:exports results~, which indicates that the code
-will not appear in the exported document. We recommend that in the
-context of this MOOC, you always leave this parameter setting as
-~:exports both~, because we want your analyses to be perfectly
-transparent and reproducible.
-
-Watch out: the figure generated by the code block is /not/ stored in
-the org document. It's a plain file, here named ~cosxsx.png~. You have
-to commit it explicitly if you want your analysis to be legible and
-understandable on GitLab.
-
-Finally, don't forget that we provide in the resource section of this
-MOOC a configuration with a few keyboard shortcuts that allow you to
-quickly create code blocks in Python by typing ~