I took the index of your words, transformed the number to binary, added three zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to convert it to binary, additional 3 zeros on the 8 digits in the binary and received 00000010011 which translates to 19 in decimal. https://bookmarkfly.com/story18827115/the-2-minute-rule-for-bip39-all-words