For words that have only three letters, there isn't a 4th letter. For instance with the word “insert”, there isn't any much more letters afterwards and therefore must be the word "insert". The word “addict” is within the BIP39 wordlist but you would have utilised “addi” for “addict”. You signed https://royalbookmarking.com/story18796103/bip39-phrase-generator-can-be-fun-for-anyone