I took the index from the words, converted the range to binary, additional 3 zeros, calculated the sha256 digest, took the main Element of the hexadecimal to convert it to binary, included 3 zeros into the eight digits in the binary and received 00000010011 which translates to 19 in decimal. https://bookmarkilo.com/story18866267/little-known-facts-about-bip39-seed-phrase-list