diff --git a/12.temporary_ins/05.coordinates-systems/30.cylindrical-coordinates/10.main/textbook.es.md b/12.temporary_ins/05.coordinates-systems/30.cylindrical-coordinates/10.main/textbook.es.md
index 9eb584a6b..bb873ac66 100644
--- a/12.temporary_ins/05.coordinates-systems/30.cylindrical-coordinates/10.main/textbook.es.md
+++ b/12.temporary_ins/05.coordinates-systems/30.cylindrical-coordinates/10.main/textbook.es.md
@@ -4,8 +4,6 @@ published: true
 routable: true
 visible: false
 lessons:
-    - slug:
-      order:
     - slug: cylindrical-coordinates-linear
       order: 1
     - slug: cylindrical-coordinates-exchange-FR-ES