For words that have only three letters, there's no 4th letter. For example with the word “increase”, there are no much more letters afterwards and thus must be the word "insert". The word “addict” is during the BIP39 wordlist however you might have utilized “addi” for “addict”. How to retrieve https://getidealist.com/story20550163/facts-about-bip39-seed-phrase-github-revealed