I took the index of the words, transformed the selection to binary, extra a few zeros, calculated the sha256 digest, took the primary Portion of the hexadecimal to convert it to binary, additional 3 zeros on the eight digits with the binary and received 00000010011 which interprets to 19 in https://bookmark-group.com/story4378496/facts-about-bip39-seed-phrase-word-list-revealed