diff --git a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/10.n1/textbook.en.md b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/10.n1/textbook.en.md
index 727f14d02..7076984c7 100644
--- a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/10.n1/textbook.en.md
+++ b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/10.n1/textbook.en.md
@@ -3,9 +3,6 @@ title: Brainstorming on the mathematical tools required at each level
 published: true
 routable: true
 visible: false
-lessons:
-    - slug: brainstorming-123-mathematical-tools
-      order: 1
 ---
 
 #### Brainstorming on the mathematical tools required at level 1