For words that only have three letters, there's no 4th letter. For example with the word “add”, there isn't any extra letters Later on and so should be the word "include". The word “addict” is during the BIP39 wordlist however, you would have used “addi” for “addict”. To test to https://mirrorbookmarks.com/story18741066/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator