I took the index from the words, converted the quantity to binary, additional a few zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to convert it to binary, additional a few zeros to the 8 digits in the binary and got 00000010011 which translates to 19 https://health-lists.com/story19488024/bip39-seed-phrase-mnemonics-generator-an-overview