For words that have only three letters, there is absolutely no 4th letter. By way of example with the word “increase”, there isn't any a lot more letters afterwards and thus needs to be the word "insert". The word “addict” is while in the BIP39 wordlist however, you might have https://myeasybookmarks.com/story4495413/top-latest-five-bip39-seed-phrase-mnemonics-generator-urban-news