I took the index in the words, transformed the quantity to binary, extra a few zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to transform it to binary, extra 3 zeros to the 8 digits with the binary and got 00000010011 which interprets to 19 https://wisesocialsmedia.com/story4447514/5-simple-techniques-for-bip39-word-list-pdf