I took the index with the words, converted the variety to binary, extra a few zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to transform it to binary, included three zeros for the 8 digits from the binary and received 00000010011 which translates to 19 in https://bookmarkstown.com/story19022839/an-unbiased-view-of-bip39-seed-phrase-github