I took the index of your words, converted the quantity to binary, extra three zeros, calculated the sha256 digest, took the very first A part of the hexadecimal to convert it to binary, extra three zeros to the 8 digits in the binary and acquired 00000010011 which translates to 19 https://bookmarkinglive.com/story19596153/the-ultimate-guide-to-bip39-seed-phrase-github