I took the index of your words, converted the range to binary, added three zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to transform it to binary, added 3 zeros to the eight digits in the binary and bought 00000010011 which translates to 19 in decimal. https://ilovebookmark.com/story18746248/5-simple-techniques-for-bip39-word-list-pdf