I took the index of your words, transformed the number to binary, additional three zeros, calculated the sha256 digest, took the main Component of the hexadecimal to convert it to binary, included three zeros to your 8 digits with the binary and bought 00000010011 which translates to 19 in decimal. https://bookmarkcork.com/story20105274/facts-about-bip39-seed-phrase-word-list-revealed