For words that have only three letters, there isn't a 4th letter. For example with the word “increase”, there won't be any additional letters Later on and therefore should be the word "insert". The word “addict” is from the BIP39 wordlist however you would've utilized “addi” for “addict”. A simple https://iowa-bookmarks.com/story14476956/the-invalid-bip39-phrase-diaries