I took the index from the words, converted the number to binary, extra 3 zeros, calculated the sha256 digest, took the very first Element of the hexadecimal to convert it to binary, additional a few zeros for the 8 digits in the binary and bought 00000010011 which translates to 19 https://baidubookmark.com/story19465238/the-definitive-guide-to-bip39-seed-phrase