For words that only have three letters, there is not any 4th letter. As an example with the word “increase”, there isn't any far more letters Later on and therefore have to be the word "include". The word “addict” is within the BIP39 wordlist however, you would've applied “addi” for https://livebackpage.com/story4906080/ledger-seed-phrase-bip39-no-further-a-mystery