Bip39 Mnemonic Generator. Constantly Test if hardware wallet maker explicitly point out the ability to restore wallet from another compatible wallet (BIP39/BIP44) from the documentation. For words that only have three letters, there is no 4th letter. For example with the word “insert”, there won't be any more letters afterwards https://freedirectory4u.com/listings13081370/bip39-checksum-https-linktr-ee-bip39-facts-about-bip39-standard-revealed