As there were four stories in each cluster, group 4 activities (similar to group 3 activities) were used 80 times in the process of simulation of the project.
由于有四个故事，在每一组，第4组的活动(类似于第3组活动)，分别用80倍，在这个过程中的仿真工程。
As there were 20 clusters of building in the overall project, group 2 activities were used 20 times in the overall simulation.
由于有20个集群的建设，在整体工程计划，第2组的活动共使用了20倍，在整体模拟。
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