I took the index of your words, converted the quantity to binary, extra three zeros, calculated the sha256 digest, took the primary Section of the hexadecimal to transform it to binary, included 3 zeros to the eight digits in the binary and obtained 00000010011 which translates to 19 in decimal. https://dftsocial.com/story19786715/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator