For words that have only 3 letters, there isn't any 4th letter. For instance with the word “add”, there are no extra letters afterwards and therefore have to be the word "include". The word “addict” is within the BIP39 wordlist however , you would've utilised “addi” for “addict”. Standard recovery https://guidemysocial.com/story4433374/new-step-by-step-map-for-ledger-seed-phrase-bip39