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A schedule  is an ordered list of directed edges of T , specifying which
flows are to be passed and in what order. Relative to such a schedule, a
flow is called active if, before it is sent, the source has itself already received
active flows from all its neighbours in T , with the possible exception of the
sink; and it is the first flow in the list with this property. This is a recursive
but effective definition. Note that the first active flow must originate in a
leaf of T , i.e., a clique in the tree with only one neighbour.

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