For words that only have 3 letters, there isn't any 4th letter. For example with the word “insert”, there won't be any additional letters afterwards and thus have to be the word "add". The word “addict” is from the BIP39 wordlist however you would've utilized “addi” for “addict”. Store your https://socialbuzzfeed.com/story4318486/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-seed-phrase-mnemonics-generator