I took the index with the words, converted the quantity to binary, extra 3 zeros, calculated the sha256 digest, took the first part of the hexadecimal to transform it to binary, additional a few zeros to the 8 digits of the binary and acquired 00000010011 which interprets to 19 in https://orangebookmarks.com/story19530713/top-guidelines-of-bip39-word-list-pdf