For words that only have three letters, there isn't a 4th letter. Such as with the word “include”, there are no more letters Later on and therefore needs to be the word "add". The word “addict” is during the BIP39 wordlist however , you might have employed “addi” for “addict”. https://minibookmarking.com/story19101349/the-5-second-trick-for-ledger-seed-phrase-bip39