For words that have only 3 letters, there is not any 4th letter. For example with the word “include”, there are no additional letters afterwards and therefore has to be the word "add". The word “addict” is during the BIP39 wordlist however you might have used “addi” for “addict”. To https://bookmarks4seo.com/story18818385/new-step-by-step-map-for-ledger-seed-phrase-bip39