I took the index on the words, converted the selection to binary, included three zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to transform it to binary, added 3 zeros into the 8 digits of your binary and acquired 00000010011 which translates to 19 in decimal. https://johsocial.com/story9539606/facts-about-bip39-seed-phrase-word-list-revealed