Let's consider a simplified version of the small tree structure from Figure 8.
考虑一个简化版的小型树结构，如图8所示。
The structure of simplified work flow model is a tree, and governmental document run and join from end to root on the tree with no separation.
简化后的公文工作流模型呈树型结构，公文从树的枝节点向根节点流转、汇合，整个流转过程没有分支。
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