For words that only have three letters, there is not any 4th letter. As an example with the word “insert”, there isn't any far more letters afterwards and thus must be the word "increase". The word “addict” is in the BIP39 wordlist however , you would have utilized “addi” for https://mnobookmarks.com/story18954859/facts-about-bip39-seed-phrase-word-list-revealed