Bip39 standard https://canvas.instructure.com/eportfolios/3396498/ricardooxtv236/bip39-generator-online-the-very-best-tools-for-secure-pocketbook-development It's extremely important the mnemonic sentences are produced from randomly chosen quantities! These figures could be created in many different various ways, that are explained in other posts below, like "What on earth is an RNG" ... https://bookmarkpressure.com/story20529325/bip39-solana-the-smart-trick-of-bip39-word-list-github-that-no-one-is-discussing-https-linktr-ee-bip39