For words that only have 3 letters, there isn't any 4th letter. Such as with the word “insert”, there won't be any far more letters afterwards and thus must be the word "increase". The word “addict” is from the BIP39 wordlist however, you might have utilized “addi” for “addict”. To https://friendlybookmark.com/story18931478/bip39-seed-phrase-fundamentals-explained