diff --git a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/30.classical-mechanics/10.n1/10.brainstorming/textbook.en.md b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/30.classical-mechanics/10.n1/10.brainstorming/textbook.en.md
index 661a3bd61..2d3f3bafb 100644
--- a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/30.classical-mechanics/10.n1/10.brainstorming/textbook.en.md
+++ b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/30.classical-mechanics/10.n1/10.brainstorming/textbook.en.md
@@ -34,7 +34,7 @@ https://m3p2.com/polyglot/brainstorming-pedagogical-teams/synthesis-structuring/
 
 A first study plan proposal : 
 
-*MECA-CLAS-Prop1-n2*    
+*MECA-CLAS-Prop1-n1*    
 
 _React (iscuss, improve) to this proposal, in the text or afterwards,_    
 _starting with 3 initials followed by the two letters of your native language(XXX-YY) :_  
@@ -72,7 +72,7 @@ To carry on
 
 New proposal for a study plan    
 
-*MECA-CLAS-Prop2-n2*  
+*MECA-CLAS-Prop2-n1*  
 
 _Start with your 3 initials followed by the two letters of your native language (XXX-YY)  :_    
 
@@ -96,7 +96,7 @@ To carry on
 
 New proposal for a study plan    
 
-*MECA-CLAS-Prop3-n3*  
+*MECA-CLAS-Prop3-n1*  
 
 Continuar 
 Continuer