Bip39 Last Word Checksum Some words are shorter than 4 letters, including the word “act”. Other words are extended than four letters, for instance “abstract”. You could think of this Instrument like a hardware or software wallet opened up where you can tinker with stuff within and do anything manually. https://top10bookmark.com/story18574324/bip39-mnemonic-seed-phrase-the-definitive-guide-to-bip39-phrase