I took the index in the words, converted the amount to binary, included three zeros, calculated the sha256 digest, took the 1st Component of the hexadecimal to transform it to binary, extra a few zeros for the 8 digits of your binary and bought 00000010011 which interprets to 19 in https://bookmarklayer.com/story19048468/5-simple-techniques-for-bip39-seed-phrase