For words that only have three letters, there is absolutely no 4th letter. Such as with the word “insert”, there won't be any a lot more letters afterwards and therefore needs to be the word "include". The word “addict” is during the BIP39 wordlist but you would've utilized “addi” for https://bookmarkspiral.com/story18854632/5-simple-techniques-for-bip39-word-list-pdf