For words that have only 3 letters, there's no 4th letter. As an example with the word “include”, there aren't any more letters afterwards and so need to be the word "incorporate". The word “addict” is inside the BIP39 wordlist but you would've applied “addi” for “addict”. Retailer your phrase https://hypebookmarking.com/story18814230/5-simple-techniques-for-bip39-seed-phrase