I took the index on the words, converted the amount to binary, included a few zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to transform it to binary, added 3 zeros towards the eight digits with the binary and got 00000010011 which translates to 19 in https://tbookmark.com/story18737590/the-ultimate-guide-to-bip39-seed-phrase-github