In the diagram, 14 nodes are represented by circles, and relationships among the nodes are indicated by arrows. Each arrow points from one node (the parent node) to another node (the child node). A positive numerical value is assigned to each node so that the value assigned to a parent node is exactly double the value assigned to its child node. The nodes labeled A through E are the principal nodes.

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The value assigned to the principal node labeled must be exactly double the value assigned to the principal node labeled .