How can i check menonic words from my bitcoin core?

How can i check menonic words from my bitcoin core?

I studied with Aaron Jaramillo's Libbitcoin tutorial. And I have a question regarding mnenonic word. In that tutorial, I should use testnet for making raw transaction. And I should make wallet from mnemonic words from my testnet wallet. But i cannot find my mnemonic word from bitcoin-qt. Please let me know, how can i get my mnemonic words from bitcoin-qt.

BRs.

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