I took the index on the words, transformed the amount to binary, added 3 zeros, calculated the sha256 digest, took the first Section of the hexadecimal to convert it to binary, included 3 zeros into the 8 digits on the binary and acquired 00000010011 which translates to 19 in decimal. https://bookmarkinglive.com/story19798041/the-ultimate-guide-to-bip39-seed-phrase-github