diff --git a/docs/Four-Space_Visualization_of_4D_Objects.html b/docs/Four-Space_Visualization_of_4D_Objects.html
index f2bf592..2df41b5 100644
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@@ -1,4 +1,4 @@
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+<!DOCTYPE HTML>
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diff --git a/docs/index.html b/docs/index.html
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+<!DOCTYPE HTML>
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