I took the index in the words, converted the variety to binary, added 3 zeros, calculated the sha256 digest, took the very first part of the hexadecimal to convert it to binary, added a few zeros for the eight digits of your binary and received 00000010011 which translates to 19 https://ticketsbookmarks.com/story18733477/considerations-to-know-about-bip39-seed-phrase-generator