For words that only have three letters, there isn't any 4th letter. Such as with the word “insert”, there are no extra letters afterwards and so has to be the word "add". The word “addict” is from the BIP39 wordlist however you would've utilised “addi” for “addict”. Art is really https://mysocialquiz.com/story4350406/the-greatest-guide-to-seed-phrase-bip39