Bip39 Npm. As palavras desta frase são selecionadas de uma lista definida de 2048 palavras, que pode ser acessada aqui ou listada abaixo: For words that have only 3 letters, there is no 4th letter. For instance With all the word “add”, there won't be any additional letters Later on https://cbpsdirectory.com/listings577320/bip39-checksum-https-linktr-ee-bip39-bip39-mnemonic-generator-fundamentals-explained