I took the index of your words, transformed the amount to binary, added 3 zeros, calculated the sha256 digest, took the main Element of the hexadecimal to transform it to binary, included three zeros into the 8 digits with the binary and got 00000010011 which interprets to 19 in decimal. https://socialstrategie.com/story4662484/facts-about-bip39-seed-phrase-word-list-revealed