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HD pockets root seed size

Mastering Bitcoin describes the method of producing the HD pockets seed:

“1. Create a random sequence (entropy) of 128 to 256 bits.”
… 6. The mnemonic code is the sequence of phrases.
… 9. PBKDF2 stretches the mnemonic and salt parameters utilizing 2048 rounds of hashing with the HMAC-SHA512 algorithm, producing a 512-bit worth as its last output. That 512-bit worth is the seed.”
Briefly – mnemonic code phrases + salt -> 512 bit see (utilizing HMAC-SHA512)

later:
“HD wallets are created from a single root seed, which is a 128-, 256-, or 512-bit random quantity. Mostly, this seed is generated from a mnemonic as detailed within the earlier part… The basis seed is enter into the HMAC-SHA512 algorithm”

1 – What is that this “root seed”? It wasn’t talked about earlier than, the creator used simply the phrase seed. If it is the identical seed as earlier than, and he simply immediately determined to name it ‘root seed’, why is it 128, 256 or 512 bit lengthy? He had mentioned it was 512. The primary part says the seed is the output of the
HMAC-SHA512, the second sections says the seed is its enter. However the second part additionally says “this seed is generated from a mnemonic as detailed within the earlier part”. So I am actually confused from his rationalization about this seed, or these seeds…
Additionally from the images it seems to be there are two completely different seeds. First part:
https://uncooked.githubusercontent.com/bitcoinbook/bitcoinbook/develop/photos/mbc2_0507.png
Second part:
https://uncooked.githubusercontent.com/bitcoinbook/bitcoinbook/develop/photos/mbc2_0509.png

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