For words that only have 3 letters, there is no 4th letter. By way of example with the word “include”, there are no extra letters Later on and so need to be the word "include". The word “addict” is inside the BIP39 wordlist but you might have used “addi” for https://bookmarkfox.com/story4330571/top-latest-five-bip39-seed-phrase-mnemonics-generator-urban-news