I took the index on the words, transformed the variety to binary, added a few zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to convert it to binary, included three zeros to your 8 digits in the binary and bought 00000010011 which interprets to 19 in https://bookmarkforce.com/story19121089/not-known-facts-about-bip39-english-words