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Top level loop

The pseudo-code of the solver algorithm is shown below.
It is basically a loop over all demands in order of priority.

Delete the existing operation-plans, if they aren’t locked

Identify the clusters to be planned
Categorize the demand to be planned by cluster and sort them by priority

Create parallel threads for the planning
In each planning thread:
  Select a cluster to solve
  If no cluster is left to be planned
    Exit the planning thread
  Loop through all demands in the cluster
    Solve the demand

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