For words that only have three letters, there is no 4th letter. For example with the word “include”, there won't be any extra letters Later on and therefore has to be the word "add". The word “addict” is during the BIP39 wordlist however , you might have employed “addi” for https://open.substack.com/pub/jaidenqrel955/p/unlocking-the-power-of-bip39-how?r=54uq0h&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true