For words that only have 3 letters, there's no 4th letter. Such as with the word “increase”, there isn't any much more letters afterwards and so have to be the word "increase". The word “addict” is during the BIP39 wordlist but you would've utilised “addi” for “addict”. Art is often https://bookmarkingalpha.com/story18992857/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39