For words that have only 3 letters, there's no 4th letter. One example is with the word “include”, there isn't any much more letters Later on and so has to be the word "add". The word “addict” is within the BIP39 wordlist but you would've applied “addi” for “addict”. Discovering https://freebookmarkpost.com/story18830746/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator