I took the index on the words, transformed the amount to binary, included a few zeros, calculated the sha256 digest, took the very first Portion of the hexadecimal to transform it to binary, included three zeros into the 8 digits with the binary and obtained 00000010011 which translates to 19 https://bookmark-share.com/story19657154/the-ultimate-guide-to-bip39-seed-phrase-github