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diff --git a/help/html/calculations/redundancy.html b/help/html/calculations/redundancy.html
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--- a/help/html/calculations/redundancy.html
+++ b/help/html/calculations/redundancy.html
@@ -1,5 +1,36 @@
-
-
-tree
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+
+
+
+Removing Redundancy
+
+
+Removing redundancy
+Selecting the option in the Alignment window's Edit
+menu or pressing 'CONTROL+D' brings up a dialog box
+asking you to select a threshold. If the percentage identity between the
+aligned positions of any two sequences in the visible alignment exceeds
+this value, the shorter sequence is discarded.
Note: The redundancy
+calculation is done when the dialog box is opened. For large numbers
+of sequences this can take a long time as all pairs have to be compared.
+
+
+