source-academy
diff --git a/‎xml/en/chapter1/section1/subsection3.xml‎
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diff --git a/‎xml/en/chapter2/section3/subsection2.xml‎
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diff --git a/‎xml/en/chapter3/section3/subsection4.xml‎
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diff --git a/‎xml/en/chapter3/section3/subsection5.xml‎
100755100644 b/‎xml/en/chapter3/section3/subsection5.xml‎
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diff --git a/‎xml/en/chapter3/section4/subsection2.xml‎
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diff --git a/‎xml/zh_CN/chapter1/chapter1.xml‎
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diff --git a/‎xml/zh_CN/chapter1/section1/section1.xml‎
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@@ -1539,4 +1539,4 @@ deriv(list("x", "*", 4), "x");
   <INDEX>differentiation<SUBINDEX>symbolic<CLOSE/></SUBINDEX></INDEX>
   <INDEX>symbolic differentiation<CLOSE/></INDEX>
   <INDEX>algebraic expression<SUBINDEX>differentiating<CLOSE/></SUBINDEX></INDEX>
-</SUBSECTION> -->
+</SUBSECTION>