I took the index of your words, transformed the amount to binary, added three zeros, calculated the sha256 digest, took the main Component of the hexadecimal to convert it to binary, extra 3 zeros into the 8 digits in the binary and acquired 00000010011 which translates to 19 in decimal. https://captainbookmark.com/story19555940/facts-about-bip39-seed-phrase-word-list-revealed