I took the index of the words, transformed the range to binary, additional 3 zeros, calculated the sha256 digest, took the initial part of the hexadecimal to transform it to binary, extra three zeros on the eight digits in the binary and obtained 00000010011 which interprets to 19 in decimal. https://socialrus.com/story18380452/the-ultimate-guide-to-bip39-seed-phrase-github