For words that only have three letters, there isn't any 4th letter. Such as with the word “insert”, there won't be any far more letters Later on and thus needs to be the word "incorporate". The word “addict” is in the BIP39 wordlist however you would have utilised “addi” for https://funbookmarking.com/story18891507/5-simple-techniques-for-bip39-seed-phrase