For words that only have 3 letters, there is no 4th letter. For instance with the word “increase”, there aren't any extra letters afterwards and therefore should be the word "insert". The word “addict” is inside the BIP39 wordlist however , you would've used “addi” for “addict”. Several Wallets:Should you https://bookmarkingbay.com/story18910078/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39