For words that have only three letters, there is not any 4th letter. Such as with the word “increase”, there aren't any much more letters Later on and so should be the word "insert". The word “addict” is in the BIP39 wordlist however , you might have employed “addi” for https://nimmansocial.com/story9398475/top-guidelines-of-bip39-word-list-pdf