For words that have only three letters, there is not any 4th letter. As an example with the word “insert”, there won't be any far more letters Later on and so should be the word "incorporate". The word “addict” is within the BIP39 wordlist but you would've applied “addi” for https://bookmarkfox.com/story4332862/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator