For words that only have 3 letters, there isn't any 4th letter. Such as with the word “insert”, there isn't any more letters Later on and thus needs to be the word "include". The word “addict” is in the BIP39 wordlist however you would've applied “addi” for “addict”. By subsequent https://captainbookmark.com/story18784808/a-secret-weapon-for-bip39-words-to-numbers