Bip39 First 4 Letters A BIP39 mnemonic sentence is usually a set of words (most commonly 12 or 24) that we can communicate with much more successfully than other figures that are not words (bits and numbers as well as like). BIP39's reason in introducing the use of mnemonic words https://bookmarkstown.com/story18743213/bip39-ian-coleman-considerations-to-know-about-seed-phrase-generator