I took the index of the words, converted the number to binary, extra a few zeros, calculated the sha256 digest, took the initial part of the hexadecimal to transform it to binary, additional a few zeros towards the eight digits with the binary and got 00000010011 which translates to 19 https://tinybookmarks.com/story19017776/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39