An assembly sequence can be automatically generated by implementing the postorder traversal to this model.

通过对该结构的后序遍历，自动生成装配序列，能有效地描述装配体。

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Binary tree operation: create a binary tree, before traversing binary, inorder, postorder binary tree traversal.

说明：二叉树操作：建立二叉树，前序遍历二叉树、中序、后序遍历二叉树。

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Binary tree operation: create a binary tree, before traversing binary, inorder, postorder binary tree traversal.

说明：二叉树操作：建立二叉树，前序遍历二叉树、中序、后序遍历二叉树。

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