I took the index of the words, converted the selection to binary, additional 3 zeros, calculated the sha256 digest, took the main Element of the hexadecimal to convert it to binary, extra a few zeros for the eight digits of your binary and received 00000010011 which translates to 19 in https://sound-social.com/story8969527/facts-about-bip39-seed-phrase-word-list-revealed