I took the index of your words, converted the number to binary, additional 3 zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to transform it to binary, included 3 zeros to your 8 digits from the binary and bought 00000010011 which translates to 19 in decimal. https://socialinplace.com/story4205427/the-greatest-guide-to-seed-phrase-bip39