I took the index of the words, converted the selection to binary, added 3 zeros, calculated the sha256 digest, took the primary A part of the hexadecimal to transform it to binary, included a few zeros into the eight digits in the binary and received 00000010011 which translates to 19 https://bookmarklayer.com/story19633907/a-secret-weapon-for-bip39-words-to-numbers