I took the index on the words, converted the amount to binary, additional a few zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to transform it to binary, added 3 zeros to the eight digits of the binary and acquired 00000010011 which translates to 19 in https://thebookpage.com/story4423203/the-ultimate-guide-to-bip39-seed-phrase-github