I took the index of your words, converted the selection to binary, additional a few zeros, calculated the sha256 digest, took the first Component of the hexadecimal to transform it to binary, added 3 zeros into the eight digits in the binary and received 00000010011 which interprets to 19 in https://squareblogs.net/edelinepge/h1-b-recognizing-bip39-a-comprehensive-overview-to-mnemonic-expressions-and