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Two level blending or pooling model(POOLINGH).
   Raw materials are selectively blended into pools, e.g., storage tanks,
   then pools are blended into finished products.
    We want to maximize the profit = sales of finished goods,
   minus cost of raw materials purchased,
    subject to satisfying quality requirements,
   such as density, sulfur fraction, Motor Octane Number,
   Research Octane Number, etc.