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diff --git a/docs/academic/chemistry/index.md b/docs/academic/chemistry/index.md
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diff --git a/docs/academic/chemistry/notes/12-5.md b/docs/academic/chemistry/notes/12-5.md
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diff --git a/docs/academic/chemistry/problems/02-20.md b/docs/academic/chemistry/problems/02-20.md
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@@ -19,6 +19,7 @@
         -   [ ] Wikibooks
         -   [ ] Wikipedia
         -   [ ] Bookboon
+        -   [ ] 
 
 ## Footer
 
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