diff --git a/articles/Cross-correlation - Wikipedia/Cross-correlation - Wikipedia.xopp.xml b/articles/Cross-correlation - Wikipedia/Cross-correlation - Wikipedia.xopp.xml
index e1bc0e3..cb09208 100644
--- a/articles/Cross-correlation - Wikipedia/Cross-correlation - Wikipedia.xopp.xml
+++ b/articles/Cross-correlation - Wikipedia/Cross-correlation - Wikipedia.xopp.xml
@@ -34,15 +34,52 @@
-
+
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-
+
+ ?
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diff --git a/articles/Focal length - Wikipedia/Focal length - Wikipedia.xopp.xml b/articles/Focal length - Wikipedia/Focal length - Wikipedia.xopp.xml
index ba4fafe..b0659f2 100644
--- a/articles/Focal length - Wikipedia/Focal length - Wikipedia.xopp.xml
+++ b/articles/Focal length - Wikipedia/Focal length - Wikipedia.xopp.xml
@@ -3,7 +3,19 @@
Xournal++ document - see https://github.com/xournalpp/xournalpp
-
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diff --git a/articles/Inch - Wikipedia/Inch - Wikipedia.xopp.xml b/articles/Inch - Wikipedia/Inch - Wikipedia.xopp.xml
index 07eae76..a563e72 100644
--- a/articles/Inch - Wikipedia/Inch - Wikipedia.xopp.xml
+++ b/articles/Inch - Wikipedia/Inch - Wikipedia.xopp.xml
@@ -6,6 +6,9 @@
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