For words that only have 3 letters, there isn't any 4th letter. For example with the word “increase”, there isn't any a lot more letters Later on and thus must be the word "insert". The word “addict” is within the BIP39 wordlist however, you would've utilised “addi” for “addict”. Art https://free-bookmarking.com/story18897224/the-basic-principles-of-bip39-passphrase-generator