Bip39 Last Word Some words are shorter than four letters, like the word “act”. Other words are longer than four letters, including “summary”. Tip: Lots of people highlight every single sixteenth word inside of a printed wordlist to create block identification much easier. A Mnemonic phrase is A personal key https://nanobookmarking.com/story18451893/bip39-format-bip39-word-list-secrets