For words that have only three letters, there isn't a 4th letter. One example is with the word “include”, there aren't any additional letters afterwards and thus must be the word "increase". The word “addict” is within the BIP39 wordlist but you would've utilised “addi” for “addict”. In this manner, https://mnobookmarks.com/story18954823/new-step-by-step-map-for-ledger-seed-phrase-bip39