The unstable tree processing is a bit different than the stable tree.
不稳定树的处理与稳定树的处理有一些不同。
If the candidate page is found in the stable tree, then it is merged and the candidate page freed.
如果候选页面位于稳定树中，则该页面被合并，候选页面被释放。
But if the page is found in the unstable tree, you merge the pages, and then migrate the node to the stable tree.
但是如果在不稳定树中发现了页面，则合并该页面，然后将该节点迁移到稳定树中。
But if the page is found in the unstable tree, you merge the pages, and then migrate the node to the stable tree.
但是如果在不稳定树中发现了页面，则合并该页面，然后将该节点迁移到稳定树中。
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