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20.test/36.temporaryDDsystem/10.a/30.en/textbook.en.md

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+---
+lessons:
+    - slug: test01
+      order: 1
+    - slug: test02
+      order: 2
+    - slug: test03
+      order: 2
+---
+
+## TEST A  
+
+If test01 : must appear with the order ABC
+
+If test02 : must appear with the order BAC
+
+If test03 : must appear with the order CAB