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This allows for the batch system to start the job only, when the appropriate number of licenses is available.
You can check the availability yourself: scontrol show lic
aa_t_a is a "ANSYS Academic Teaching License" with a maximum of 16 tasks.
aa_r is a "ANSYS Academic Research License" with 16 inclusive tasks. Research jobs with more than 16 tasks cost additional "aa_r_hpc" licenses.

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