diff --git a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/40.n4/textbook.es.md b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/40.n4/textbook.es.md
index aa635d8d9..ac7166d8e 100644
--- a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/40.n4/textbook.es.md
+++ b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/40.n4/textbook.es.md
@@ -12,8 +12,6 @@ lessons:
 
 --------------------------------
 
---------------------------------
-
 con una **primera clasificación para ordenar** la lluvia de ideas (conteo, geometría, etc.).
 *No presagia títulos de capítulos*.