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[ { "id" : "actor-1", "type" : "ClutterActor", "margin" : [ 10 ] }, { "id" : "actor-2", "type" : "ClutterActor", "margin" : [ 10, 20 ] }, { "id" : "actor-3", "type" : "ClutterActor", "margin" : [ 10, 20, 30 ] }, { "id" : "actor-4", "type" : "ClutterActor", "margin" : [ 10, 20, 30, 40] } ]