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A multiprocessor with 8 processors has 20 attached tape drives. There is a large number of jobs submitted to the system, and each requires 4 tape drives to complete execution. Assume that each job starts running with only 3 tape drives for a long period before requiring the fourth tape drive for a short period toward the end of its operation. Also assume an endless supply of such jobs. The maximum number of jobs that can execute at once are _______.

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