I took the index from the words, transformed the quantity to binary, extra three zeros, calculated the sha256 digest, took the initial A part of the hexadecimal to convert it to binary, additional three zeros towards the 8 digits from the binary and got 00000010011 which interprets to 19 in https://listbell.com/story8544005/little-known-facts-about-bip39-seed-phrase-list