I took the index of the words, transformed the number to binary, included three zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to transform it to binary, extra a few zeros to your 8 digits of the binary and acquired 00000010011 which translates to 19 in https://mylittlebookmark.com/story4463477/the-ultimate-guide-to-bip39-seed-phrase-github