I took the index of the words, converted the range to binary, added a few zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to transform it to binary, included a few zeros on the eight digits in the binary and got 00000010011 which interprets to 19 https://bookmarkmargin.com/story19608193/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator