graph: {title: "force-directed graph"
        layoutalgorithm: forcedir
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        node.height    :  30
        node.fontname  : "helvR10"
        edge.arrowstyle: none
        attraction     :  60
        repulsion      :  60
        gravity        :   0.0
        randomrounds   :  10
        randomimpulse  :   5
        tempmax        : 100
        tempmin        :   2
        tempscheme     :   2
        tempfactor     :   1.01
        randomfactor   :  80
        magnetic_field1: orthogonal
        magnetic_field2: top_to_bottom

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