Bip39 Wallet. As palavras desta frase são selecionadas de uma lista definida de 2048 palavras, que pode ser acessada aqui ou listada abaixo: For words that only have three letters, there isn't any 4th letter. One example is With all the word “add”, there isn't any additional letters Later on https://princedirectory.com/listings13124113/bip39-mnemonic-code-converter-tool-https-linktr-ee-bip39-bip39-passphrase-generator-fundamentals-explained