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20.test/35.temporaryDsystem/30.c/textbook.en.md

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+---
+lessons:
+    - slug: test01-en
+      order: 3
+    - slug: test02-en
+      order: 3
+    - slug: test03-en
+      order: 1
+---
+
+## TEST C 
+
+If test01: must appear in order ABC 
+
+If test02: must appear in order BAC
+
+If test03: must appear in order CAB 
+