Update textbook.en.md

e136b80a · Claude Meny · b24911eb · e136b80a
Commit e136b80a authored Mar 15, 2021 by Claude Meny
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--- a/12.temporary_ins/05.coordinates-systems/20.cartesian-coordinates/10.main/textbook.en.md
+++ b/12.temporary_ins/05.coordinates-systems/20.cartesian-coordinates/10.main/textbook.en.md
 ---
 title: Cartesian coordinates
-published: true
+published: false
 routable: false
 visible: false
 lessons: