I took the index of the words, converted the quantity to binary, added a few zeros, calculated the sha256 digest, took the first part of the hexadecimal to convert it to binary, added three zeros to the eight digits of the binary and received 00000010011 which translates to 19 in https://businessbookmark.com/story4341006/an-unbiased-view-of-bip39-seed-phrase-github