Bip39 Mnemonic For illustration, take the word “accident” for instance. Its very first 4 letters are “acci”. When you look at the BIP39 word list, you will note that no other word begins with “acci”. The software of a wallet utilizes a whole set of words taken from a vocabulary; https://nimmansocial.com/story8284647/bip39-html-detailed-notes-on-bip39-phrase