For words that have only 3 letters, there is not any 4th letter. Such as with the word “include”, there aren't any far more letters Later on and therefore have to be the word "include". The word “addict” is during the BIP39 wordlist however you would've utilised “addi” for “addict”. https://livebookmarking.com/story18781187/how-much-you-need-to-expect-you-ll-pay-for-a-good-valid-bip39-seed-phrase