I took the index in the words, converted the selection to binary, extra 3 zeros, calculated the sha256 digest, took the initial A part of the hexadecimal to convert it to binary, added a few zeros for the eight digits in the binary and got 00000010011 which interprets to 19 https://bookmarktune.com/story19514655/a-secret-weapon-for-bip39-words-to-numbers