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2-3一种特殊的树,它满足两个条件:(1)每个内部结点有两个或三个子结点;(2)所有的叶结点到根的路径长度相同;如果一棵2-310个叶结点,那么它可能有_________个非叶结点。 (多选)2-3 tree is a special kind of tree, which satisfies:(1) Every internal node has 2 or 3 children nodes. (2) All the leaf nodes have the same path length from the root node.If a 2-3 tree has 10 leaf nodes, then it may have __________ non-leaf nodes. (multiple choice)