Lesson Feedback%3A Merkle DAGs - Lesson 4 (Introducing Merkle DAGs)

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URL of the lesson that's confusing:
In general, any change to a node in a Merkle DAG is propagated to each of the changed node’s ancestors
What's confusing about this lesson?
If I add one file to a node ,so the node's CID will changed. So If I add n files to a node ,the node will create n+n!/2 CIDs,all of them can be used.so if I add 1000 file to a node,will run out of CIDs?
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QmZV5yU5aDXhdXYsmmCBYbCtNsJpHE5bvnVgpY1p1RuBB3
QmWgeVjaWrpzmuQ295Ae2Qapj7sNvKpPfMJ3SW1Y9wVEfB

those two CIDs are point to a same node

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