Draw arrows to indicate the electron flow for the following intramolecular Diels-Alder
cycloaddition reaction: 
Definitions:
Optimal Solution
The best possible outcome or solution among all feasible alternatives, often found through mathematical methods or modeling.
Transportation Model
A mathematical model used in operations research to optimize the allocation and movement of resources across locations, minimizing costs while meeting requirements.
Cells
In manufacturing, a cell refers to a setup of machinery or workstations arranged in a sequence to optimize the production process.
Sources
The origins or providers of information, materials, or resources.
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