# If the found jobs include a completed job, and all found completed jobs have consistent output, return one of them. Which specific job is returned is undefined.
# If the found jobs only include incomplete jobs, return one of them. Which specific job is returned is undefined.
# If no job has been returned so far, create and return a new job.
# If the found jobs include a completed job, and all found completed jobs have consistent output, return one of them. Which specific job is returned is undefined.
# If the found jobs only include incomplete jobs, return one of them. Which specific job is returned is undefined.
# If no job has been returned so far, create and return a new job.