For words that have only three letters, there is absolutely no 4th letter. For instance with the word “increase”, there won't be any a lot more letters Later on and therefore must be the word "insert". The word “addict” is inside the BIP39 wordlist however , you would have utilized https://bookmarktiger.com/story18912420/the-5-second-trick-for-ledger-seed-phrase-bip39