Ononot — A Sankey diagram represents energy flow. If a node has a sin

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A Sankey diagram represents energy flow. If a node has a single input $I$ and two outputs $O_1$ and $O_2$ such that $O_1 = k I$ and $O_2 = (1-k)I$ , and these outputs further split into secondary nodes, which conservation property must be maintained at the junction?