For words that only have three letters, there's no 4th letter. For instance with the word “increase”, there aren't any extra letters afterwards and therefore has to be the word "include". The word “addict” is during the BIP39 wordlist but you might have used “addi” for “addict”. This additional complexity https://fellowfavorite.com/story20079800/top-latest-five-bip39-seed-phrase-mnemonics-generator-urban-news