This model represents an electronic assembly and test system.
Two types of parts (A and B) arrive to the system, and need to
be pre-processed. After that, the components are assembled and
inserted in a case, which is sealed (sealer process).
The 91% of the parts pass the inspection, and are shipped. The rest
need to be reworked. After the rework process, the 20% of the parts
are scrapped, while the rest are salvaged and shipped.