I took the index of the words, converted the range to binary, additional three zeros, calculated the sha256 digest, took the primary A part of the hexadecimal to convert it to binary, extra a few zeros into the eight digits of your binary and bought 00000010011 which interprets to 19 https://sociallweb.com/story4265620/5-simple-techniques-for-bip39-word-list-pdf