How can I establish selection rules for these dock stations without multiple decide modules? I've tried "Pick Station" and model docks as stations with Expression

5-5 Trucks arrive with EXPO(9) interarrival times (all times are in minutes) to an un- load area that has three docks. The unload times are TRIA(25, 28, 30), TRIA(23, 26, 28) and TRIA(22, 25, 27) for docks 1, 2, and 3, respectively. If there is an empty dock, the truck proceeds immediately to that dock. Assume zero travel times to all docks. If there is more than one empty dock, the truck places preference on the higher-numbered dock (3, 2, 1). If all the docks are busy, it chooses the dock with the minimum number of trucks waiting. If there is a tie, it places preference on the lowest numbered dock (1, 2, 3). De- velop a simulation model with modules from the Advanced Process panel, using re- quired modules from the Basic Process panel to implement the selection logic. Run your model for 20,000 minutes and collect statistics on dock utilization, number in queue, time in queue, and the time in system. This facility is in a congested urban area where land is expensive and you've been asked to decide how much space should be planned for the trucks in queue to unload; address this question (being mindful of statistical issues)? 5-5 Trucks arrive with EXPO(9) interarrival times (all times are in minutes) to an un- load area that has three docks. The unload times are TRIA(25, 28, 30), TRIA(23, 26, 28) and TRIA(22, 25, 27) for docks 1, 2, and 3, respectively. If there is an empty dock, the truck proceeds immediately to that dock. Assume zero travel times to all docks. If there is more than one empty dock, the truck places preference on the higher-numbered dock (3, 2, 1). If all the docks are busy, it chooses the dock with the minimum number of trucks waiting. If there is a tie, it places preference on the lowest numbered dock (1, 2, 3). De- velop a simulation model with modules from the Advanced Process panel, using re- quired modules from the Basic Process panel to implement the selection logic. Run your model for 20,000 minutes and collect statistics on dock utilization, number in queue, time in queue, and the time in system. This facility is in a congested urban area where land is expensive and you've been asked to decide how much space should be planned for the trucks in queue to unload; address this question (being mindful of statistical issues)