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Immediate Textual Analysis
Mathematica 6 allows efficient analysis of large-scale textual data—here finding the Zipf-like word frequency distribution from the built-in sample text of Darwin's Origin of Species.
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Click for copyable input
ListLogLogPlot[

 Reverse[Sort[

   Last /@ Tally[ExampleData[{"Text", "OriginOfSpecies"}, "Words"]]]],

  Joined -> True, Filling -> Axis, PlotRange -> All, Frame -> True]
Out[1]=