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This is a Multi-Objective Optimization Problem.

Given:

- $M$ products
- $N$ machines
- each product:
- has to pass through machine once (in the same sequence $1, 2, ..., N$)
- has some due date
- has delay for each machine

There are two objectives:

- minimize makespan (produce as fast as possible)
- minimize total tardiness (be able to meet deadlines)