I took the index of your words, transformed the number to binary, added a few zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to convert it to binary, added three zeros to the 8 digits in the binary and received 00000010011 which interprets to 19 in https://throbsocial.com/story20686742/the-ultimate-guide-to-bip39-seed-phrase-github