I took the index of your words, transformed the selection to binary, extra 3 zeros, calculated the sha256 digest, took the 1st Component of the hexadecimal to transform it to binary, included three zeros for the 8 digits of the binary and got 00000010011 which interprets to 19 in decimal. https://socialmediatotal.com/story4036276/little-known-facts-about-bip39-seed-phrase-list