How to find the `root canister` principal of NNS?

NNS is an amazing technology and implementation. I am wandering in its code ground.
I am excited about the tree-like architecture of whole NNS network with its SNS network .
I have searched in and read NNS documentation.
Haven’t find the NNS root canister principal yet.

Here’s the NNS Root canister:

You can find it, for example, by going through the canisters on the NNS subnet or by looking in source code: ic/rs/nns/canister_ids.json at master · dfinity/ic · GitHub

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Oh, very clear. Thanks for answering !