I took the index from the words, transformed the number to binary, extra a few zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to convert it to binary, added 3 zeros into the 8 digits of the binary and acquired 00000010011 which interprets to 19 in https://writeablog.net/ipennywpzc/h1-b-opening-the-power-of-bip39-exactly-how-to-produce-and-use-mnemonic