I took the index of your words, converted the range to binary, extra 3 zeros, calculated the sha256 digest, took the main A part of the hexadecimal to transform it to binary, included three zeros towards the 8 digits of your binary and acquired 00000010011 which interprets to 19 in https://guidemysocial.com/story4234538/an-unbiased-view-of-bip39-seed-phrase-github