I took the index in the words, converted the quantity to binary, added three zeros, calculated the sha256 digest, took the very first Section of the hexadecimal to transform it to binary, included 3 zeros into the eight digits of the binary and got 00000010011 which translates to 19 in https://bookmarksparkle.com/story18956500/bip39-seed-phrase-mnemonics-generator-an-overview