I took the index from the words, converted the range to binary, extra a few zeros, calculated the sha256 digest, took the main A part of the hexadecimal to convert it to binary, added three zeros to the eight digits with the binary and obtained 00000010011 which translates to 19 https://geilebookmarks.com/story18740009/an-unbiased-view-of-bip39-seed-phrase-github