diff --git a/01.curriculum/01.physics-chemistry-biology/01.niv1/default.en.md b/01.curriculum/01.physics-chemistry-biology/01.niv1/topic.en.md
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rename from 01.curriculum/01.physics-chemistry-biology/01.niv1/default.en.md
rename to 01.curriculum/01.physics-chemistry-biology/01.niv1/topic.en.md