Adjacent tree graph的用法和样例：
- Especially, the adjacent tree graph and line graph are both included as special cases of our generalization.
- Introduced in this paper is the forest graph of a connected graph which is a generalization of the tree graph.
- Select one or more objects and drag their names from an explorer into the ICE Tree graph to create a node for it.
- Select the null and drag its name from an explorer into the ICE Tree graph to create a node for it.