For words that only have three letters, there isn't a 4th letter. As an example with the word “increase”, there won't be any a lot more letters Later on and thus must be the word "insert". The word “addict” is inside the BIP39 wordlist however, you would've utilized “addi” for https://tinybookmarks.com/story18834040/not-known-factual-statements-about-bip39-explained