diff --git a/00.brainstorming-pedagogical-teams/20.levels-N3-N4/textbook.en<br>.md b/00.brainstorming-pedagogical-teams/20.levels-N3-N4/textbook.en<br>.md
deleted file mode 100644
index 7c42fd201..000000000
--- a/00.brainstorming-pedagogical-teams/20.levels-N3-N4/textbook.en<br>.md
+++ /dev/null
@@ -1,27 +0,0 @@
----
-title : Brainstorming on recommendations for the levels N3 and N4
-published : false
-visible : false
----
-### Brainstorming on recommendations for the levels N3 and N4
-
-(Please, indicate your 3 initials, and expose your ideas, contribute)
-
-* XXX : add an idea ....<br>
-<br>comment / reply / criticize :<br>
-YYY : ........ <br>
-ZZZ : ........ <br>
-
-* YYY : add an idea ....<br>
-<br>comment / reply / criticize :<br>
-XXX : ........ <br>
-ZZZ : ........ <br>
-
-* CME : nothing special to say. Just make sure there is
-no dark areas: example if we use the divergence operator in a course, we must check
-that the educational resource which presents the concept of divergence from the concept
-flux through a closed surface (not just the expression of div in a given
-coordinate system) is available, and linked to this course. In short, check all the
-consistency of the pedagogical path (from N1 to N4), we are not limited here by a number of hours
-in front of students (in physics, who does not devise learn by heart, the link and interest are broken, the ability
-and freedom to devise and innovate are diminished).