I took the index of the words, converted the range to binary, added 3 zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, extra a few zeros for the eight digits of the binary and got 00000010011 which translates to 19 in https://socialupme.com/story4523829/the-definitive-guide-to-bip39-seed-phrase