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diff --git a/devel/hs-dlist/pkg-descr b/devel/hs-dlist/pkg-descr
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+Differences lists are a list-like type supporting O(1) append. This is
+particularly useful for efficient logging and pretty printing, (e.g.
+with the Writer monad), where list append quickly becomes too expensive. 
+
+WWW: http://code.haskell.org/~dons/code/dlist/