I took the index of the words, converted the number to binary, added 3 zeros, calculated the sha256 digest, took the primary A part of the hexadecimal to transform it to binary, extra three zeros to your 8 digits from the binary and bought 00000010011 which translates to 19 in https://tetrabookmarks.com/story19637419/the-greatest-guide-to-seed-phrase-bip39