I took the index of the words, converted the selection to binary, included three zeros, calculated the sha256 digest, took the 1st Portion of the hexadecimal to transform it to binary, extra 3 zeros into the eight digits of your binary and bought 00000010011 which interprets to 19 in decimal. https://thesocialroi.com/story8582797/bip39-seed-phrase-fundamentals-explained