For words that have only three letters, there is not any 4th letter. By way of example with the word “insert”, there are no additional letters Later on and therefore should be the word "increase". The word “addict” is while in the BIP39 wordlist but you would've employed “addi” for https://bookmark-media.com/story18930723/how-much-you-need-to-expect-you-ll-pay-for-a-good-valid-bip39-seed-phrase