For words that only have 3 letters, there isn't any 4th letter. For instance with the word “include”, there isn't any far more letters Later on and thus has to be the word "include". The word “addict” is from the BIP39 wordlist but you might have employed “addi” for “addict”. https://bookmarkswing.com/story20309349/ledger-seed-phrase-bip39-no-further-a-mystery