For words that only have three letters, there isn't a 4th letter. As an example with the word “insert”, there isn't any far more letters afterwards and therefore should be the word "increase". The word “addict” is in the BIP39 wordlist but you would have made use of “addi” for https://bookmarksystem.com/story18653269/examine-this-report-on-bip39-mnemonic-phrase-tool