I took the index with the words, transformed the quantity to binary, additional 3 zeros, calculated the sha256 digest, took the primary Portion of the hexadecimal to transform it to binary, added a few zeros to your 8 digits with the binary and bought 00000010011 which interprets to 19 in https://mirrorbookmarks.com/story18758164/little-known-facts-about-bip39-words