For words that only have three letters, there is not any 4th letter. As an example with the word “increase”, there isn't any much more letters afterwards and therefore need to be the word "include". The word “addict” is during the BIP39 wordlist however , you would've employed “addi” for https://7prbookmarks.com/story19052514/considerations-to-know-about-bip39-word-list-pdf