For words that have only three letters, there is not any 4th letter. As an example with the word “include”, there isn't any a lot more letters Later on and therefore have to be the word "increase". The word “addict” is in the BIP39 wordlist however , you would've utilised https://linkingbookmark.com/story18927292/examine-this-report-on-bip39-mnemonic-phrase-tool