I took the index from the words, transformed the quantity to binary, additional 3 zeros, calculated the sha256 digest, took the first Component of the hexadecimal to convert it to binary, extra a few zeros for the eight digits of the binary and obtained 00000010011 which interprets to 19 in https://getsocialsource.com/story4436665/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator