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+-r requirements.txt
+
+# We support a Genshi treewalker that can be used to serialize Genshi
+# streams.
+genshi
+
+# DATrie can be used in place of our Python trie implementation for
+# slightly better parsing performance.
+datrie
+
+# charade can be used as a fallback in case we are unable to determine
+# the encoding of a document.
+charade