The preorder sequence of a tree is ABDEGCF, and its inorder sequence is DBGEACF, please write down its postorder sequence. (There is no blank space between letters) 已知一棵树的前序遍历为 ABDEGCF ,中序遍历为 DBGEACF ,求这棵树的后序遍历。(字母和字母之间不要有空格)
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