For words that only have three letters, there isn't a 4th letter. Such as with the word “increase”, there aren't any additional letters afterwards and therefore has to be the word "insert". The word “addict” is in the BIP39 wordlist but you might have used “addi” for “addict”. Unlock your https://webcastlist.com/story20947653/not-known-factual-statements-about-bip39-explained