I took the index in the words, converted the amount to binary, additional a few zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to transform it to binary, extra 3 zeros into the eight digits of the binary and got 00000010011 which translates to 19 in https://getsocialsource.com/story4207984/5-simple-techniques-for-bip39-word-list-pdf