For words that have only 3 letters, there is no 4th letter. As an example with the word “add”, there isn't any far more letters Later on and therefore have to be the word "insert". The word “addict” is during the BIP39 wordlist but you might have applied “addi” for https://mysocialguides.com/story4565420/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39