I took the index with the words, transformed the variety to binary, additional 3 zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to transform it to binary, extra a few zeros into the eight digits on the binary and acquired 00000010011 which translates to 19 in https://friendlybookmark.com/story18733482/bip39-seed-phrase-mnemonics-generator-an-overview