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    { "id" : "http://dbpedia.org/resource/Abelian_sandpile_model"
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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "The Abelian sandpile model, also known as the Bak–Tang–Wiesenfeld model, was the first discovered example of a dynamical system displaying self-organized criticality.  It was introduced by Per Bak, Chao Tang and Kurt Wiesenfeld in a 1987 paper.The model is a cellular automaton.  In its original formulation, each site on a finite grid has an associated value that corresponds to the slope of the pile." ] ,
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        "http://dbpedia.org/ontology/thumbnail" : [ "http://commons.wikimedia.org/wiki/Special:FilePath/Backtang2.png?width=300"] } } }
