For words that only have three letters, there is no 4th letter. For example with the word “add”, there isn't any a lot more letters Later on and so have to be the word "increase". The word “addict” is during the BIP39 wordlist however, you would have utilized “addi” for https://blogfreely.net/travenmdoq/h1-b-bip39-word-listing-explained-your-important-source-for-creating-secure