For words that have only 3 letters, there is not any 4th letter. By way of example with the word “add”, there won't be any far more letters Later on and thus need to be the word "include". The word “addict” is during the BIP39 wordlist however, you would've utilised https://socialmediastore.net/story19468516/examine-this-report-on-bip39-mnemonic-phrase-tool