I took the index from the words, converted the range to binary, added a few zeros, calculated the sha256 digest, took the main Element of the hexadecimal to convert it to binary, extra three zeros on the 8 digits of the binary and acquired 00000010011 which translates to 19 in https://bookmarkstumble.com/story20709485/top-guidelines-of-bip39-word-list-pdf