For words that have only 3 letters, there is no 4th letter. Such as with the word “incorporate”, there won't be any more letters Later on and so need to be the word "include". The word “addict” is during the BIP39 wordlist however , you would have applied “addi” for https://hotbookmarkings.com/story19620883/the-ultimate-guide-to-bip39-seed-phrase-github