I took the index of your words, transformed the selection to binary, included three zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to transform it to binary, extra 3 zeros on the eight digits on the binary and got 00000010011 which translates to 19 in decimal. https://guidemysocial.com/story4191991/the-definitive-guide-to-bip39-seed-phrase