For words that only have 3 letters, there is no 4th letter. For example with the word “include”, there are no much more letters Later on and so has to be the word "increase". The word “addict” is from the BIP39 wordlist but you might have utilised “addi” for “addict”. https://onlybookmarkings.com/story18736602/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting