I took the index on the words, transformed the quantity to binary, additional a few zeros, calculated the sha256 digest, took the very first part of the hexadecimal to convert it to binary, included three zeros for the 8 digits on the binary and bought 00000010011 which translates to 19 https://sound-social.com/story8848197/the-ultimate-guide-to-bip39-seed-phrase-github