For words that only have 3 letters, there is not any 4th letter. One example is with the word “increase”, there won't be any far more letters afterwards and so should be the word "include". The word “addict” is during the BIP39 wordlist however , you would've employed “addi” for https://thebookmarkking.com/story18768871/top-guidelines-of-bip39-word-list-pdf