I took the index of the words, transformed the quantity to binary, extra a few zeros, calculated the sha256 digest, took the 1st Portion of the hexadecimal to transform it to binary, included three zeros to your 8 digits of the binary and obtained 00000010011 which translates to 19 in https://bookmarkuse.com/story18651550/facts-about-bip39-seed-phrase-word-list-revealed