I took the index of your words, converted the range to binary, added 3 zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to transform it to binary, added 3 zeros into the eight digits of your binary and bought 00000010011 which translates to 19 in decimal. https://ledbookmark.com/story4675408/not-known-factual-statements-about-bip39-explained