I took the index from the words, transformed the range to binary, added a few zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, added three zeros to your 8 digits on the binary and bought 00000010011 which interprets to 19 in https://expressbookmark.com/story18802628/facts-about-bip39-seed-phrase-word-list-revealed