I took the index of your words, converted the selection to binary, included 3 zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to transform it to binary, added 3 zeros on the eight digits from the binary and received 00000010011 which translates to 19 in decimal. https://worldsocialindex.com/story4526847/the-definitive-guide-to-bip39-seed-phrase