I took the index from the words, converted the variety to binary, added 3 zeros, calculated the sha256 digest, took the first Component of the hexadecimal to convert it to binary, extra a few zeros towards the 8 digits on the binary and obtained 00000010011 which translates to 19 in https://bookmarklayer.com/story19010778/bip39-seed-phrase-mnemonics-generator-an-overview