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+digraph weight_tree{

+node [shape=box color=lightblue,style=filled];

+ 

+all [label="All items",xlabel="100"];

+t1 [label="Part 1",xlabel="75"];

+t2 [label="Part 2",xlabel="25"];

+p1 [label="pPart 1",xlabel="50"];

+p2 [label="pPart 2",xlabel="50"];

+p3 [label="pPart 3",xlabel="50"];

+p4 [label="pPart 4",xlabel="50"];

+all -> t1 [label="75%"];

+all -> t2;

+t1 -> p1 [label="20%"];

+t1 -> p2;

+t2 -> p3;

+t2 -> p4;

+}

+