Note: in horizontal cloning, it is possible to have more than one clone node.
注：在水平克隆中，可能有多个克隆节点。
But t is not known to redeclare clone as public, so cloning is also out.
但是重新声明clone为public并不知道T，因此克隆也无济于事。
But t is not known to redeclare clone as public, so cloning is also out.
但是重新声明clone为public并不知道T，因此克隆也无济于事。
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