For words that have only 3 letters, there is absolutely no 4th letter. For example with the word “include”, there isn't any far more letters Later on and thus must be the word "incorporate". The word “addict” is within the BIP39 wordlist but you would've made use of “addi” for https://macrobookmarks.com/story18988382/little-known-facts-about-bip39-seed-phrase-list