For words that have only three letters, there's no 4th letter. Such as with the word “add”, there isn't any far more letters Later on and therefore should be the word "increase". The word “addict” is from the BIP39 wordlist however you would've applied “addi” for “addict”. You may have https://bookmarkextent.com/story20533640/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting