For words that only have 3 letters, there isn't any 4th letter. For instance with the word “include”, there isn't any additional letters Later on and thus should be the word "include". The word “addict” is within the BIP39 wordlist but you would've applied “addi” for “addict”. Standard recovery phrases https://bookmarkingquest.com/story18962748/facts-about-bip39-seed-phrase-github-revealed